When Seleukus died, his empire began to decline. In the middle of the third century B.C., the two provinces-Bactria and Parthia revolted against the rule of Antiochus II, the grandson of Seleukus Parthia declared independence in 248 B.C., while Bactria became independent in 250 B.C. At that time, the Mauryan empire was also declining gradually. After the death of Asoka in 232 B.C. the political condition of the country had become deplorable. The rulers of the two Greek states--Bactria and Parthia, fully availed themselves of the political disintegration of India. They attacked the north-western part of the country. The circumstances helped the foreign invaders and the major portion of Punjab, Afghanistan and Sindh was conquered by the Greeks. In this way, the two dynasties, Indo-Bactrian and the Indo-Pathian were settled down in the north-west India. These dynasties were also known as a whole, the Indo-Greek dynasty.