The correct answer is option 1, Chandragupta I. Chandragupta I was called Lichchavi Dau-hitra because he married a princess from the Lichchavi dynasty. The Lichchavis were an important ruling clan in ancient India, and their alliance with Chandragupta I helped to strengthen his position and expand his empire. The marriage alliance with the Lichchavis also played a significant role in establishing the Gupta dynasty`s political and military influence. Chandragupta I`s son, Samudragupta, went on to become a renowned ruler and continued his father`s policy of diplomatic marriages with other ruling clans. However, it was Chandragupta I who first initiated this practice with the Lichchavis, making him known as Lichchavi Dau-hitra.