The academic debate on the ideas and practices that organized succession to the sultanate of Mamluk Egypt and Syria (1250-1517) is long-standing and vexed. This article adds to this debate by bringing in a novel perspective: the “Family-In-Law Impulse.” First, an empirical identification of whom Mamluk sultans between Barqūq (784 AH/1382 CE) and Ḫušqadam (872 AH /1467 CE) married is presented, suggesting that many of these unrelated sultans were connected nonetheless through marriage. The hermeneutics of this observation are then dealt with, by reviewing the possibilities of what these marital ties might mean. It is argued that they reflect one of many strategies aiming at social reproduction: by marrying into their predecessor’s family, ne...