The First Caliph was Abu Bakr who was a very close and good friend of Muhammad (PBUH)
The second Caliph was Umar he was also a very good and close froend of Muhammad (PBUH)
Third was Ali he was married to one of Muhammad (PBUH)'s daughter Fatimah!
and fourth i dont know!...sorry!
Sunni
The first four Caliphs are all informed by Prophet Muhammad (PBUH) that they are promised by God to among ten prophet Muhammad companions who to be accepted the God Paradise in their 2nd life. Also, the four have close relations to prophet Muhammad (PBUH). Prophet Muhammad (PBUH) married the daughter of each of the first two Caliphs. The third Caliph married the daughter of prophet Muhammad and when this daughter died he married the other daughter. The fourth prophet married Fatima (may God be pleased with her) the youngest daughter of the prophet.
abu baker umar uthman ali
The first four Caliphs after Muhammad, more commonly known as The Rightly Guided Caliphs were Abdullah ibn Abi Quhaafah (known by his nickname, Abu Bakr), Umar ibn al-Khattab, Ali ibn Talib and Uthman ibn Affan, in this order of succession.
The Rashidun Caliphate was the first of the four major caliphates established after the death of the Islamic prophet Muhammad. It was ruled by the first four successive caliphs (successors) of Muhammad after his death in 632 CE (AH 11). These caliphs are collectively known in Sunni Islam as the Rashidun, ... However, after six months the group made peace with Abu Bakr and Ali ...
The Umayyad Caliphate came after the four Rightly-Guided Caliphs.
The first four Caliphs are the most trusted followers of the holy Prophet (SAW) who were elected by the majority vote of the holy Companions RA of the holy Prophet (SAW). For this they are called the Khulafai Rashideen.
as u know that there were four caliphs after hazrat Muhammad ( P B U H )wen there is no leader the unity is broken so after longfights the first caliph hazrat abu bakar sidduiqe razitallah anah was made r first caliph or in other words : The death of Muhammad in 632 created confusion in the nascent Muslim community, for Muhammad had left no details as to who should succeed him. After a heated discussion by the senior members of the community, Abu Bakr was selected as the first caliph.
First 4 Caliphs were not missionaries to Africa , but many other companions of prophet were .
they ruled differently
Prophet Muhammad (PBUH) and the four first caliphs (or Muslim rulers); namely Abou Bakr, Omar Ibn AlKhattab, Othman Ibn Affan, and Ali Ibn about Taleb.
There were FOUR Rightly-Guided Caliphs after Muhammad's death (Abu Bakr, Omar, Othman, and Ali). After Ali was assassinated, the Umayyads swept into power, ending the age of the Rightly-Guided Caliphs and beginning a more imperial form of government.