Sagara became the emperor. The place known as Gangasagara was excavated by his sons

Expressions researched:
"Sagara later became the emperor. The place known as Gangasagara was excavated by his sons"

SB Canto 9

Knowing that she was pregnant, the co-wives of the wife of Bāhuka conspired to give her poison with her food, but it did not act. Instead, the son was born along with the poison. Therefore he became famous as Sagara ("one who is born with poison"). Sagara later became the emperor. The place known as Gaṅgāsāgara was excavated by his sons.

SB 9.8.4, Translation:

Knowing that she was pregnant, the co-wives of the wife of Bāhuka conspired to give her poison with her food, but it did not act. Instead, the son was born along with the poison. Therefore he became famous as Sagara ("one who is born with poison"). Sagara later became the emperor. The place known as Gaṅgāsāgara was excavated by his sons.