Faolain Mairin was the head of the Mairin Clan, mother of Seadhna Finian, grandmother of Fiona Mairin, and a respected elder among the Sinlarine. She and Lachlann Strahan were often seen talking and arguing. She and Lachlan gave information about the Lament of the Stormborn to Erikur Spald in late 1017 AE.