Who among the following was the first to sign the 'Instruments of Accession'?

Instrument of Accession was a legal document first introduced by Government of India Act, 1935. It was used in and after 1947 to enable each of rulers of princely states under British parliamentary to join one of the new dominions of India or Pakistan. Dewan of Travancore was the first to sign 'Instrument of Accession'.