On 13 September 1297, when Beatrice was only four years old, the bilateral agreement, known as the Treaty of Alcañices, was signed between Castile and Portugal, putting an end to the hostilities between both kingdoms and establishing the definitive borders.
13. září 1297, když byly Beatrix jen čtyři roky, byla u Alcañices sjednána smlouva mezi Kastilií a Portugalské, která ukončila nepřátelství mezi oběma zeměmi a určila definitivní hranice.