 The first indication that Ferdinand was independently reigning over Castile, or was at least recognised as count in his own right, is a charter of 1 November 1032 from the monastery of San Pedro de Arlanza, which does not mention his father, but dates it to the time of "Fernando Sánchez bearing the county".Sancho's decision to name his son as count in Castile preserved its high degree of autonomy, although no Castilian document after 1028 is dated by the reign of Bermudo III nor is he ever named as king of León.The only sovereign whose regnal year was used was Sancho III, making Ferdinand the first count of Castile not to recognise the suzerainty of the king of León.