How to find the Persians from the plot? (The Witcher 3: Wild Hunt)

Grog_King
has already told everyone a hundred times, after the storyline, the characters cannot be found !!!

I accidentally found Keira Metz after beating the game))) I climbed the map and found it in Kaer Morhan! When you talk to her, 1 new dialogue about Lambert is added)))

Spoiler