Donal Cam O'Sullivan Beare, Prince of Beare, 1st Count of Berehaven (1561–1618) was the last independent ruler of the
O'Sullivan Beara sept, and thus the last
O'Sullivan Beare, a Gaelic princely title, in the southwest of Ireland during the early seventeenth century, when the
English crown was attempting to secure their rule over the whole island.