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Baldwin of Montferrat was born in December 1177 or January 1178 to Sibylla, sister of King Baldwin IV of Jerusalem, after whom he was named. His father, William of Montferrat, had died in June 1177. Though only 16, the king was not expected to live long, nor could he marry and have children, because he had contracted leprosy and was growing weaker. William had thus been expected to succeed him. By July 1178, the king recognized his sister as his new heir presumptive. Her son, Baldwin of Montferrat, followed her in the line of succession.