Mother of the King by Lavinia Collins

War is on the horizon when Arthur, Igraine's son is declared King of Britain.

With her son lost and Merlin back at court, Igraine fights for control of the kingdom. Uther is broken by grief, weakening and dying, and Igraine is locked in a conflict with the witch over the destiny of her son, in which there can be only one survivor, and Igraine has not survived the dangers of court to give up now.

Mother of the King can be enjoyed on its own or as the final part of the Igraine Trilogy. Look out for the first book, The Cornish Princess, and the second, Merlin's Curse. All of these books are available for free on Kindle Unlimited.