Rhaenyra Targaryen is a highly controversial figure in Westerosi history, even if modern audiences of House of the Dragon are rightfully sympathetic toward her. She was named heir to the Iron Throne, which many lords of Westeros didn't swallow well, and she was nicknamed "Maegor with teats" during the war with her brother Aegon II. But the biggest controversy surrounding Rhaenyra was actually the true father of her three eldest sons.
Source：https://www.cbr.com/hotd-rhaenyra-targaryen-sons-father/
