See the "House of the Dragon" Characters Before and After the Time Jumps

Although he is very briefly spotted as a young child (played by Matthew Carver), Laenor's first real introduction comes when he is a young man, serving with Daemon Targaryen during the war in the Stepstones. He's the son of Corlys and Rhaenys and an esteemed knight who is betrothed to Rhaenyra in an attempt to reunite the branches of the Targaryen clan.