Chandragupta's rule over Magadha has been attributed to his marital alliance with the Lichchhavis. This alliance surely benefited him materially as well. In fact in one of his inscriptions, his successor Samudragupta proudly refers to himself as Lichchhavidauhitra (this refers to the fact that his mother was a Lichchhavi). It is significant that Samudragupta would refer to his maternal lineage instead of the more common referrence to paternal lineage. There are also several coins issued by Samudragupta that commemorate the marriage of Chandragupta to Kumaradevi, the Lichchhavi princess.
Most records indicate that Chandragupta reigned in the period c. 319-335 A.D.