Cos Sylvan is a Canadian bassist and musician who is widely known for having toured with the Swedish heavy metal outfit Ghost. Sylvan is active on his @cos__sylvan named Instagram account. Born on May 9, Cos Sylvan hails from Ottawa, Canada. Calm, caring, cautious, very calm, a little shy, he was never sure about his smile, his nose and his eyes, people told him that his eyes were too small and that his nose was too big and that his smile was weird :/