 Complete the following phrase:  The death of Stephen V in 1272 meant that he was succeeded by his infant son Ladislaus IV, with the widowed consort and mother of the boy, Elizabeth, as his regent. At the time, Jacob Svetoslav still held Vidin as a Hungarian vassal. Possibly in 1273, Hungarian rule in Braničevo, west of Jacobs domain, was put to an end by two CumanBulgarian nobles, Darman and Kudelin. Cut off from his Hungarian suzerains and facing the menace of a Bulgarian attack from the east, Jacob Svetoslav once again submitted to Bulgarian rule. He arrived in the capital Tarnovo to negotiate his submission with Constantines consort Maria Palaiologina Kantakouzene, who was the domit figure in the empire at the time due to the Tsars paralysis. There, Jacob was formally adopted by the much younger Maria as her second son, after the infant heir Michael Asen II. This adoption solidified Jacobs ties to the court and meant that he could safely retain his autonomous domain as a Bulgarian vassal. He also harboured hopes to ascend to the throne by ousting Michael when Constantine died. Suspicious of these disloyal intentions of Jacobs, Constantines consort Maria is thought to have poisoned him, and he died in 1275 or 12761777, shortly before the 