María had executed a will in Valladolid on 8 November 1351 in which she asked to be buried at the Royal Chapel of the Cathedral of Seville where her husband Alfonso XI had been buried and that, if his remains were transferred to another church, hers should also be transferred and buried alongside her husband.
María meninggalkan sepucuk surat wasiat di Valladolid on 8 November 1351 yang isinya bahwa ia berharap untuk dimakamkan di Kapel Kerajaan Katedral Seville dimana suaminya Alfonso XI dimakamkan dan bahwa, jika jenazah suaminya dipindahkan ke gereja lain, maka jenazahnya juga harus dipindahkan dan dimakamkan di sisi suaminya.