Question: Typhoon Nanmadol was derived from the name of a ruined city that was the capital of the Saudeleur Dynasty until when?
Sentence (from "Nan Madol"): The site core with its stone walls encloses an area approximately 1.5 km long by 0.5 km wide and it contains nearly 100 artificial islets—stone and coral fill platforms—bordered by tidal canals.
Relevant evidence: No