Bahrain
Portuguese and early modern era

In 1521, the Portuguese Empire allied with Hormuz and seized Bahrain from the Jabrid ruler Muqrin ibn Zamil, who was killed during the takeover. Portuguese rule lasted for around 80 years, during which time they depended mainly on Sunni Persian governors. The Portuguese were expelled from the islands in 1602 by Abbas I of the Safavid Iran, which gave impetus to Shia Islam. For the next two centuries, Persian rulers retained control of the archipelago, interrupted by the 1717 and 1738 invasions of the Ibadis of Oman. During most of this period, they resorted to governing Bahrain indirectly, either through the city of Bushehr or through immigrant Sunni Arab clans. The latter were tribes returning to the Arabian side of the Persian Gulf from Persian territories in the north who were known as Huwala. In 1753, the Huwala clan of Nasr Al-Madhkur invaded Bahrain on behalf of the Iranian Zand leader Karim Khan Zand and restored direct Iranian rule.

In 1783, Al-Madhkur lost the islands of Bahrain following his defeat by the Bani Utbah clan and allied tribes at the 1782 Battle of Zubarah. Bahrain was not new territory to the Bani Utbah; they had been a presence there since the 17th century. During that time, they started purchasing date palm gardens in Bahrain; a document shows that 81 years before the arrival of the Al Khalifa, one of the sheikhs of the Al Bin Ali tribe (an offshoot of the Bani Utbah) had bought a palm garden from Mariam bint Ahmed Al Sanadi in Sitra island.

The Al Bin Ali were the dominant group controlling the town of Zubarah on the Qatar peninsula, originally the centre of power of the Bani Utbah. After the Bani Utbah gained control of Bahrain, the Al Bin Ali had a practically independent status there as a self-governing tribe. They used a flag with four red and three white stripes, called the Al-Sulami flag in Bahrain, Qatar, Kuwait, and the Eastern province of the Kingdom of Saudi Arabia. Later, different Arab family clans and tribes from Qatar moved to Bahrain to settle after the fall of Nasr Al-Madhkur of Bushehr. These families included the House of Khalifa, Al-Ma'awdah, Al-Buainain, Al-Fadhil, Al-Kuwari, Al-Mannai, Al-Noaimi, Al-Rumaihi, Al-Sulaiti, Al-Sadah, Al-Thawadi and other families and tribes.

The House of Khalifa moved from Qatar to Bahrain in 1799. Originally, their ancestors were expelled from Umm Qasr in central Arabia by the Ottomans due to their predatory habits of preying on caravans in Basra and trading ships in Shatt al-Arab waterway until Turks expelled them to Kuwait in 1716, where they remained until 1766.

Around the 1760s, the Al Jalahma and House of Khalifa, both belonging to the Utub Federation, migrated to Zubarah in modern-day Qatar, leaving Al Sabah as the sole proprietors of Kuwait.
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