During this time, Aegon II was injured while Ser Otto Hightower (Rhys Ifans) was beheaded and Alicent was imprisoned.
Aegon and his family were spirited out of King’s Landing, according to A World of Ice and Fire. Rhaenyra was eventually forced from the throne and Aegon took control.
Later in the Dance of the Dragons after Aegon II died, Rhaenyra’s son Aegon III was put on the Iron Throne after much bloodshed.
Alicent’s grand-daughter Jaehaera was married to Aegon III and so joining the Blacks and the Greens.
But Alicent opposed the union and so she didn’t attend the ceremony and in Fire & Blood she is said to have told Jaehaera to kill her new husband Aegon.
Given Alicent refused to be reconciled and accept the outcome of the Dance of the Dragons with Aegon now on the Iron Throne, she was again thrown into prison.
She stayed in Maegor’s Holdfast, a square fortress in the middle the Red Keep in King’s Landing.
This was where Alicent lived out the rest of her days and only had the company of a septa and serving girls.