The Chola dynasty was one of the most powerful and influential dynasties in South India. They ruled over a vast empire that extended from present-day Tamil Nadu to parts of Sri Lanka. The Cholas had a strong military and administrative system which allowed them to expand their territory and establish their dominance over other kingdoms.

One of the significant achievements of the Chola dynasty was the unification of the Vengi Kingdom of the Eastern Chalukyas with the Chola Empire. This was accomplished by the Chola ruler, Kulottunga I.

Kulottunga I was the son of Vikrama Chola and ascended the throne in 1070 CE. He was an able ruler who expanded the boundaries of the Chola Empire through military conquests and diplomatic alliances. Kulottunga I was successful in bringing several regions under his control and establishing his authority over them.

In the case of the Vengi Kingdom, Kulottunga I waged a series of successful military campaigns against the Eastern Chalukyas. The Eastern Chalukyas were a powerful dynasty that ruled over the coastal Andhra region. They had been in conflict with the Cholas for several years.

Kulottunga I defeated the Eastern Chalukyas and annexed their territory, thus bringing the Vengi Kingdom under the control of the Chola Empire. This was a significant achievement as it strengthened the Chola Empire and extended its influence over a larger area.

By uniting the Vengi Kingdom with the Chola Empire, Kulottunga I brought about political stability and economic prosperity to the region. He implemented effective administrative measures and encouraged trade and commerce. The Vengi region became an important center for trade and cultural exchange under Chola rule.

Kulottunga I's successful military campaigns and administrative skills earned him the title "Vengi Konda Chola," which means "the Chola who conquered Vengi." His reign marked a period of Chola dominance and expansion, and his achievements laid the foundation for the subsequent success of the Chola dynasty.

In conclusion, it was Kulottunga I who united the Vengi Kingdom of the Eastern Chalukyas with the Chola Empire. Through his military prowess and administrative abilities, he successfully annexed the Vengi Kingdom and extended the boundaries of the Chola Empire. This unification brought about political stability and economic prosperity to the region and further strengthened the Chola dynasty's influence in South India.