Many years before the Targaryens came to Dragonstone with fire and blood, House Velaryon established themselves in the Blackwater, an ambitious family of merchants and sailors who ruled the Narrow Sea just as the dragonlords ruled the skies. Throughout their history, they have been tied intimately to the Targaryen dynasty- to their benefit and their peril.
The building used as backdrop here is the awesome Villa Rustic by Fanatik Architecture available at Mainstore.