 The government, however, refused to issue negotiations because of the costs.After the accession of Gustav III and the coup d'état which introduced absolute monarchy, his brother terminated these plans against their mother's will in October 1772, and began negotiations for a marriage between Charles and his cousin Hedwig Elizabeth Charlotte of Holstein-Gottorp.As King Gustav had not consummated his own marriage, he wished to place the task of providing an heir to the throne with his brother.