Ahmed ibn Muhammad ibn Khalifa , was the progenitor of the ruling Al Khalifa family of Bahrain

Bahrain

' , officially the Kingdom of Bahrain , is a small island state near the western shores of the Persian Gulf. It is ruled by the Al Khalifa royal family. The population in 2010 stood at 1,214,705, including 235,108 non-nationals. Formerly an emirate, Bahrain was declared a kingdom in 2002.Bahrain is...

 and the first monarch

King of Bahrain

The King of Bahrain ‎ is the monarch and head of state of Bahrain. Between 1783 and 1971, the Bahraini monarch held the title of Hakim, and, from 1971 until 2002, the title of Emir...

 or hakim

Hakim (title)

' and ' are two Arabic titles derived from the same triliteral ḤKM "appoint, choose, judge". Compare the Hebrew title hakham.-Hakīm :...

of Bahrain. All of the Al Khalifa monarchs of Bahrain are descendants of Ahmed ibn Muhammad ibn Khalifa. He is commonly referred to as Ahmed al-Fateh (Ahmed the Conqueror) for conquering Bahrain.

Ahmed's family were the rulers of Qatar

Qatar

Qatar , also known as the State of Qatar or locally Dawlat Qaṭar, is a sovereign Arab state, located in the Middle East, occupying the small Qatar Peninsula on the northeasterly coast of the much larger Arabian Peninsula. Its sole land border is with Saudi Arabia to the south, with the rest of its...

. When Ahmed became the ruler, he also conquered Bahrain. The family lost Qatar in the nineteenth century. Now they rule Bahrain.

He had four children and they were Abdulla, Salman, Mohamed and Yousif.