Sir Cain is a high ranking knight sworn to Greenmarke and Lord Daemyon Barranzo.

The son of old lord Tobias Tumble, and brother to Thomas Tumble, husband to lady Bella Bimblebond, after the Verdant rebellion where House Tumble fought against house Barranzo with their liege lords, House Barranzo decided to take one of Tobias's children and make him guard the members of House Barranzo for his life. Surprisingly, Sir Cain always keeps in high spirits, and many think he is not forced to his post against his will but rather enjoys his duty.