House Marston of Karthmere is an extinct noble house of the Borderlands. Their sigil were two black bear heads facing each other on green.

Their seat was the castle of Karthmere, which was granted to them after the extinction of House Karling. However, the Marstons also died out, like all the Houses to hold Karthmere, and the castle was passed on to House Whitegard, a cadet branch of House Blackgard.

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