Hoards of Western Kshatrapa coins frequently contain coins of one Isvaradatta, who seems to be a usurper. He does not name his father, nor does he normally
date the coins in the usual way. His reverse legend includes the words varshe prathame (first year) or varshe dvitiye (second year). Thus, although the
coins look superficially to belong to the Kshatrapa series, most authors agree that he did not belong to the royal family. Certain of his coins seem to have a date on the
obverse, which has been tentatively read as 164. Thus it seems Isvaradatta tried to usurp the throne from Vijayasena. His attempt did not last long as the year 2 coins
are very rare and no later date coins are known.