Regalport is the seat of power for the Seadragons and the
capital of High Prince Rygar ir’Wynarn’s Principality. It lies
on the eastern shore of Greentarn island in the Lhazaar
Principalities.  It is the largest and most prosperous town of
the Principalities and is sometimes called the “Jewel of the
Lhazaar Sea”.  The town is the port of call for the Seadragons
and their fleet of 20 vessels. It’s ruler, High Prince Rygar,
who claims to have a royal Gallifaran bloodline, wishes to unite
the various principalities, but is currently seen as a leader
among equals, though he represented the region at Thronehold.
House Thuranni have their headquarters in Regalport after having
accepted an invitation by then High Prince Horget Black twenty-
five years ago.   Eberron - Return of the Lich Queen Grokkit