Abu'l-Hajjaj Yusuf I (June 29, 1318 – October 19, 1354), known by the regnal name al-Muayyad bi'llah (Arabic: ?????? ??????, romanized: al-Mu?ayyad bi-?llah, lit.
'He who is aided by God'), was the seventh Nasrid ruler of the Emirate of Granada in Al-Andalus on the Iberian Peninsula.