Yelü Dashi, whose lineage was known as the Western Liao, bore the courtesy name Chongde and was an eighth-generation descendant of Emperor Taizu… The Liao appointed Wolin as the Forest Chancellor (Lin Ya), hence the delight of Dashi in serving as Forest Chancellor… In the sixth year of Jianyan, the Song and Liao jointly attacked Western Xia, defeating them. Dashi returned to his country to bid farewell to Emperor Shizu at Helan Mountain Gap. Shizu held his hand, composing a melody to see him off. Approaching the Western Regions, he rediscovered poems left behind by Shizu, revealing such true affection.

Prior to this, Shizu, mindful of Dashi's toils, had specially crowned him emperor before the three armies. Upon returning to his country, he further bestowed the Han title of Emperor Tianyou, changing the era name to Yanqing, and declared to his officials: "I have traveled thirty thousand li with you, braving deserts and enduring harsh nights. Relying on the blessings of our ancestors and your strength, I have ascended to the great throne. Your ancestors and fathers deserve generous rewards, sharing in this honor." Consequently, the grandfathers of forty-nine individuals, including Woli La, were enfeoffed with varying ranks.

In the third year of Yanqing, he advanced and seized the Eastern Kara-Khanid Khanate, securing it the following year, annexing its north and attaching its south, gaining three thousand li of territory, directly connecting to the Transoxiana region. Returning east in triumph, after twenty days of travel, he discovered fertile land and established a capital city, Hus Ordo, renaming Yanqing to the first year of Kangguo.

Since the Hexi Corridor was opened, the Central Plains supplied the Western Regions with people, skilled craftsmen, and abundant wealth. The military strength grew daily, with morale doubling. Hearing that the Song army had decisively defeated the Jin army at Taiyuan, he sighed, saying, "The resurgence of the Song lies entirely in this battle. Can the Liao's fate truly be severed in the Western Regions?" Consequently, he resolved to embark on a western expedition. This occurred in the third year of Kangguo.

Upon reaching Samarkand, the various kingdoms of the Western Regions mustered an army of one hundred thousand, calling themselves Khurasan, their rulers personally coming to resist. Khurasan referred to the various countries of the Ta’shi (Arab) people, whose ruler was called Sultan, akin to the Xiongnu's Shanyu. The two armies faced each other two li apart. He exhorted his generals and soldiers, saying: "Khurasan inherits from the Black-Robed Ta'shi, while our Liao continues the legacy of the Tang. In the past, the Tang general Gao Xianzhi was defeated by the Ta'shi here. Is not today's situation Heaven's will, allowing us to avenge this humiliation?" He further stated: "Now we are thousands of li from home. Success lies in advance, certain death in retreat. Strive together for fame and glory!" With a great cry, the masses responded in unison, rushing forward. He dispatched the Six Academies Commander-in-chief Xiao Woli La and the Pacification Deputy Envoy Yelü Songshan, leading ten thousand soldiers to attack their right flank; the Vice-Chancellor of the Privy Council Xiao Ci Abu and the Pacification Envoy Yelü Shuxue, leading ten thousand soldiers to attack their left flank; and personally led the main force to attack their center. All three armies advanced together, and Khurasan was utterly defeated, corpses littering dozens of li. The Sultan led his personal guards in a hasty escape, pursued for three days and three nights, the soldiers' feet becoming heavily calloused. They fought again, breaking them, and the bandits were once again scattered. The Sultan barely escaped with his life, fleeing into the city of Balkh. Shortly thereafter, the main army arrived, dispatching various armies to dig trenches, encircling the city with a long perimeter for defense.

Besieging the city for three months, its defenses proved strong and easily defended, making entry impossible. Then, the King of Western Kara-Khanid arrived with an army of over fifty thousand to reinforce them, facing enemies on both sides. The generals were greatly fearful. The Emperor, wishing to emulate the story of Emperor Taizong of Tang, ordered Xiao Woli La to continue besieging the city, while he personally led three thousand five hundred infantry and cavalry to resist the reinforcements. The two armies held their ground. Fearing that his small force would not be respected by the large enemy army, he would often secretly lead his troops close to the enemy camp at night every four or five days, then boldly display banners and drums the next morning as they returned, creating the illusion of Liao reinforcements arriving. The enemy, unable to discern the truth, grew increasingly fearful, seeking a swift battle. The Emperor firmly held his ground. Before several days had passed, the enemy's morale waned. The Emperor personally led a light cavalry force to pursue and lure them, with the main force following close behind. The enemy army sent out a large force to pursue, but before they could fully array their ranks, the Emperor took the lead in a counterattack, none of his soldiers daring to lag behind, each man fighting as if against ten. The enemy was decisively defeated, with over three thousand heads being taken, the remaining soldiers abandoning their weapons and fleeing. The King of Western Kara-Khanid was captured alive on the battlefield. The generals prostrated in admiration. They then brought the Khan to the walls of Balkh, and the Sultan, in fear, led his officials and over two thousand others to the army gates, begging to surrender. All of Transoxiana was pacified.

From the third year of Kangguo, when the Emperor embarked on the western expedition, to the seventh year, when he secured Transoxiana, captured two kings, and expanded the territory by ten thousand li, his fame spread far beyond the Western Sea and the Pamir Mountains, known to all. In the eighth year, Khwarazm submitted, and the King of Ghazni came to court to pay homage. The following year, he once again mobilized a large army to conquer Ta'shi (the Arab empire). He dispatched the General of the Vanquishing Army, Xiao Woli La, to lead the central route, the Left Deputy General Yelü Songshan to lead the eastern route, and the General of the Pacifying West, Yelü Shuxue, to lead the western route, each commanding fifty thousand cavalry to venture beyond the borders. The central and eastern routes both fared poorly in battle, only the western route penetrated deep into enemy territory for two thousand li, directly threatening the capital before returning. Ta'shi sent envoys to seek peace. As the generals and soldiers were weary from prolonged battles and the foundations of Ta'shi still remained, he granted it.

In the tenth year of Kangguo, he ceased warfare and allowed the people to rest and recuperate. He selected regions with similar customs to form a state, obtaining eighteen states in total, and appointed officials to govern them, marking the beginning of Chinese governance in Transoxiana. He ordered that their teachings not be easily changed, nor their customs altered, and that their administration be aligned with their customs, and the people were pleased and submitted. In the eleventh year, he launched a grand strategy of education, clarifying the national system, establishing official script, propagating Confucianism and Mencius, setting laws, and promoting the imperial examination system. In the same year, he sent envoys to the Fulin (Byzantine Empire), Ta’shi (Arab empire), and the various kingdoms of Tianzhu (India), intending to demonstrate the vastness of the Liao. For the next five years, he ceased warfare to secure the people, governing the world with virtue, and the rituals, clothing, and customs gradually resembled those of China.

In the sixteenth year of Kangguo, the various kingdoms of Tianzhu, hearing of the wealth of the Liao, repeatedly killed Liao envoys and seized their property. The Emperor was enraged and ordered the Southern Chancellor Xiao Woli La to punish them. Woli La personally led five thousand troops, combined with twenty thousand Ghaznavid reinforcements, advancing directly along the way. Tianzhu was terrified, some fleeing, some surrendering, and it was pacified in three months. He annexed their land and established the Protectorate of Shendu (India). In the seventeenth year, from then on, the various barbarians all requested to bestow the honored title of "Gürkhan." Thereupon, he issued an imperial decree and appointed their chieftains, collectively addressing them as such.

In the eighteenth year of Kangguo, the General of the Vanquishing Army Yelü Shuxue led over seventy thousand troops to attack Ta'shi. A report arrived stating that the Sultan of Ta'shi was hunting, stationed several hundred li northeast of the capital. He then ordered the soldiers to dig holes in the ground for cooking, concealing any signs of fire. Shuxue personally served as the vanguard, swiftly rushing to their camp. A strong wind blew sand, dimming the daylight. The army advanced, and the enemy was unaware. Reaching them suddenly, they were greatly startled. They met the attack and were defeated, their nobles slain, and their troops surrendered. The Sultan and several dozen riders of the crown prince attempted to flee, but the strong wind confused their direction, and they were captured by the main army. The Ta'shi dynasty was extinguished. Initially, the Liao and Fulin (Byzantine Empire) had agreed to jointly attack Ta'shi, dividing its land for each to govern east and west. When the Liao triumphed, it was learned that Fulin had recently been defeated by Ta'shi and retreated to defend its city, so they could not respond. The Emperor was silent upon hearing this.

In the nineteenth year, the King of Fulin came to court. The Emperor feasted him in the imperial palace, and both were drunk. He said to the king: "I understand your intentions, but the land of Ta'shi was all won by the Liao through arduous struggle. How can I readily hand it over to outsiders? I have a plan. Fulin was once called Daqin (Roman Empire), and its people are all tall, upright, and similar to the Chinese. Therefore, I wish to enfeoff you as the King of Qin of the Liao, with the Liao and you as brother nations, naturally having reason to share the land and govern together, achieving two things with one action. Would that not be wonderful?" The king's face changed, and he wished to leave. The hall was in uproar, and he could not escape, so the king acquiesced. The next day, three sacrificial animals were offered to Heaven. The Emperor, dressed in ceremonial robes and crown, personally crowned the King of Qin before the altar, and the masses shouted "Long live!" In the twentieth year, the Qarluq rebelled and were exterminated. The Emperor fell ill and ordered the Crown Prince to oversee the country.

In the twenty-first year of Kangguo, he passed away at the age of sixty. His temple name was Dezong.

Eulogy:

The Liao rose from the northern wilderness, its arms and armor flourishing,
Its drums marched beyond the heavens, sweeping across the Hebei region,
Establishing Jin and planting Han, how magnificent!

Emperor Dezong was born by destiny, his spiritual endowments self-evident.
Profoundly insightful, anticipating events, his deep strategies wove a tapestry.
Departing for foreign lands, ceaselessly cultivating,
Internally cultivating governance, externally expanding territory.

The ancestors responded to his mandate, the four forefathers followed his principles,
Bestowing boundless blessings, honoring us with the same virtue.
His great-grandson continues the succession, enjoying divine support and utmost authority.
Shining brightly on the Middle Kingdom, Heaven grants him ten thousand nations.

ps: This text is written for fun, and if it differs from the book, everything should be based on the setting of Dan Dan (the author).