Explanation:
The Gupta dynasty ruled over a large part of northern India from the 4th to 6th centuries AD. The Guptas were known for their patronage of art, literature, and science. They also instituted a number of administrative reforms that helped to consolidate their power.

Chandragupta II:
Chandragupta II, also known as Vikramaditya, was one of the most powerful kings of the Gupta dynasty. He ascended the throne in the year 56 of the Gupta era, which corresponds to 375 AD. Chandragupta II is known for his military conquests, which extended the Gupta empire to its greatest extent.

Samudragupta:
Samudragupta was the son and successor of Chandragupta I. He is known for his military campaigns, which helped to expand the Gupta empire. Samudragupta was also a patron of the arts and literature. He was succeeded by his son, Chandragupta II.

Kumargupta:
Kumargupta was the son and successor of Chandragupta II. He is known for his patronage of the arts and literature. Kumargupta was a devout follower of the god Vishnu and is credited with building a number of temples dedicated to Vishnu.

Skandagupta:
Skandagupta was the son and successor of Kumaragupta. He is known for his military campaigns against the Huns, who had invaded northern India. Skandagupta is also known for his patronage of the arts and literature.

Conclusion:
In conclusion, Chandragupta II ascended the throne in the year 56 of the Gupta era. He is known for his military conquests, which extended the Gupta empire to its greatest extent. Chandragupta II is considered one of the most powerful kings of the Gupta dynasty and is also known as Vikramaditya.