Question: Who is Isabella, Countess Of Lennox's father-in-law?
Sentence (from "William Comyn of Kirkintilloch"): He was a son of John Comyn, Lord of Badenoch( died c. 1275) and Alicia de Ros. William was married to Isabella Russell, daughter of Isabella, Countess of Menteith and John Russell.
Relevant evidence: No