Which title is reserved for Muhammad's successors?

Emir
80
Caliph
641
Maharaja
125
Hadith
64
Caliph, Arabic khalīfah (“successor”), ruler of the Muslim community. When the Prophet Muhammad died (632 CE), Abū Bakr succeeded to his political and administrative functions as khalīfah rasūl Allāh, “successor of the Messenger of God,” but it was probably under ʿUmar ibn al-Khaṭṭāb, the second caliph, that the term caliph came into use as a title of the civil and religious head of the Muslim state.
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Emir
Caliph
Maharaja
Hadith
answers
flagPoland
9%
70%
14%
5%
818
flagUnknown
2%
70%
20%
5%
34
flagthe United Kingdom
8%
70%
4%
16%
24
flagPakistan
0%
61%
0%
38%
13
flagthe United States
11%
60%
11%
11%
35
flagCanada
10%
50%
10%
30%
10