Its owner is called Abd al-Khalifa

The Messenger of God, may God bless him and grant him peace, said in his supplication to his Lord during his travels, You are the companion in the travel

The saying went on and the caliph is among the family, so he called him a caliph when he appointed him as his successor, i.e., explain. He is the caliph, that is, the one who succeeds the traveler in his family is a caliph