This year marks the three-hundredth birthday of the oldest high-style, brick merchant’s dwelling in America—the Warner House in Portsmouth, New Hampshire (Fig. 1). In December 1715, Archibald Macpheadris, a Scots-Irish shipowner and sea captain from Northern Ireland, purchased land on Daniel Street, a short distance from his Piscataqua River wharf. He soon married Sarah Wentworth, the teenage daughter of the Lieutenant Governor, and built her the most stylish dwelling in the Piscataqua River region.