House Sarsfield, lords of Sarsfield, True to the Mark House Sarsfield is a noble house from the Westerlands, sworn to house Lannister. They blazon their shields with a green arrow on white bend on green. Their seat Sarsfield is situated along the River Road, northeast of Casterly Rock and southwest of the Golden Tooth. Ser Melwyn Sarsfield is a knight from House Sarsfield. He is married to Shierle Swyft.