TgJ Is2:16 :כָל דְיָתְבִין בְנֵיסֵי יַמָא וְעַל כָל דְשָרַן בְבִירָוָת שוּפרָא‏ : all who dwell in the sea provinces and all who reside in splendid palace precincts
See the entire entry for bīrā, bīrtā n.f. fortress