Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection, the worst name in the sight of Allah Almighty will be that of a man who is named 'Malik al-Amlak' (King of Kings)." In the narration of Abu Bakr bin Abi Shaybah: "There is no king except Allah Almighty."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19312