King Jaehaerys I Targaryen

Jaehaerys I's father was King Aenys I Targaryen and his mother was Alyssa Baratheon (neé Velaryon).  His paternal grandparents were King Aegon I and Queen Rhaenys Targaryen. He had a brother and two sisters, named Aegon, Rhaena and Alysanne. He had a half-brother and a half-sister, named Boremund and Jocelyn.