Samghadāman was Dāmasena's brother and probably a rebel against his brother. We surmise this from the fact that his coins, which are extremely
rare, are dated from just one year, 149, which was in the middle of Dāmasena's reign. Further, Samghadāman's coins name him mahakshatrapa, in direct
conflict with Dāmasena's own title, and his coins all exhibit the characteristics of coins from mint B .... hence they were issued from a different mint. Judging by the
extreme rarity of the coins, Dāmasena must have put down the rebellion in short order.