itants of Qatar and the Kassites in modern-day Bahrain. Among the findings were 3,000,000 crushed snail shells and Kassite potsherds. It has been sug settlement, the Azores became known as the Flemish Islands or the Isles of Flanders. Prince Henry the Navigator was responsible for this settlement. His sister, Isabel, was married to Duke Philip of Burgundy of which Flanders was a part. There was a revolt against Philip's rule and disease and hunger became rampant. Isabel appealed to Henry to allow some of the unruly Flemings to settle in the Azores. He granted this arers, mercenaries, volunteers and soldiers who were attempting to establish the Azores as a staging post for a rival pretender to the Portuguese throne. Following the success of his fleet at the Battle of Ponta Delgada captured enemies were hanged from yardarms, as they were considered pirates by Philip II. Opponents receiving the news variously portrayed Philip II as a despot or "Black Legend"; the sort of insult widely made against contemporary monarchs engaged in aggressive empire building and the European Wars of Religion. An English raid of the Azores in 1589 successfully plundered some harbouring ships and islands; a repeat eight years later, the Islands Voyage, failed. Spain held the Azores under the "Babylonian captivity" of 1580–1642. In the late 16th century, the Azores and Madeira began to face problems of overpopulation. Spawning from that particular economic problem, some of the people began Cardinal-King of Portugal the nation fell into a dynastic crisis with various pretenders to the Crown of Portugal. Following his proclamation in Santarém, António, Prior of Crato was acclaimed in the Azores in 1580 (through his envoy António da Costa), but was expelled from the continent following the Battle of Alcântara. Yet, through the administration of Cipriano de Figueiredo, governor of Terceira (who continued to govern Terceira in the name of ill-fated, former-king Sebastian of Pgested that Qatar is the earliest known site of shellfish dye production, owing to a Kassite purple dye industry which existed on the coast. In 224 AD, the Sasanian Empire gained control over the territories surrounding the Persian Gulf. Qatar played a role in the commercial activity of the Sasanids, contributing at least two commodities: precious pearls and purple dye. Under the Sasanid reign, many of the inhabitants in Eastern Arabia were introduced to Christianity following the eastward dispersal of the religion by Mesopotamian Christians. Monasteries were constructed and further settlements were founded during this era. During the latter part of the Christian era, Qatar comprised a region known as 'Beth Qatraye' (Syriac for "house of the Qataris"). The region was not limited to Qatar; it also included Bahrain, Tarout Island, Al-Khatt, and Al-Hasa. In 628, Muhammad sent a Muslim envoy to a ruler in Eastern Arabia named Munzir ibn Sawa Al Tamimi and requested that he and his subjects accept Islam. MunHuman habitation of Qatar dates back to 50,000 years ago. Settlements and tools dating back to the Stone Age have been unearthed in the peninsula. Mesopotamian artifacts originating from the Ubaid period (c. 6500–3800 BC) have been discovered in abandoned coastal settlements. Al Da'asa, a settlement located on the western coast of Qatar, is the most important Ubaid site in the country and is believed to have accommodated a small seasonal encampment. Kassite Babylonian material dating back to the second millennium BC found in Al Khor Islands attests to trade relations between the inhabzir obliged his request, and accordingly, most of the Arab .