Menasseh Ben Israel may have been involved in providing slave ships from Holland that worked with Cromwell to kidnap and enslave Irish children and women and send them to America to their slavery death. He was a kabbalist, too. From Wikipedia:
Manoel Dias Soeiro(1604 – November 20, 1657), better known by his Hebrew name Menasseh ben Israel (מנשה בן ישראל), also, Menasheh ben Yossef ben Yisrael, also known with the Hebrew acronym, MB"Y, was a Portuguese rabbi, kabbalist, scholar, writer, diplomat, printer and publisher, founder of the first Hebrew printing press (named Emeth Meerets Titsma`h) in Amsterdam in 1626.
In 1644, Menasseh met Antonio de Montezinos, a Portuguese traveler and Marrano Sephardic Jew who had been in the New World. Montezinos convinced him of his conclusion that the South America Andes' Indians were the descendants of the lost ten tribes of Israel. This purported discovery gave a new impulse to Menasseh's Messianic hopes, as the settlement of Jews throughout the world was supposed to be a sign that the Messiah would come. Filled with this idea, he turned his attention to England, whence the Jews had been expelled since 1290. He worked to get them permission to settle there again and thus hasten the Messiah's coming.
He found much Christian support in England to readmit the Jews as 1666 approached. During the Commonwealth, the question of the readmission of the Jews was often mooted under the growing desire for religious liberty. Besides this, Messianic and other mystic hopes were current in England. He first published his book, the Hope of Israel, in Amsterdam in Hebrew (Mikveh Israel) or in Latin (Spes Israelis).[2] In 1650, it was translated into English and published in London; his account of descendants of the Lost Tribes being found in the New World deeply impressed public opinion.[2]
Oliver Cromwell was sympathetic to the Jewish cause, partly because of his tolerant leanings but chiefly because he foresaw the importance for English commerce of the participation of the Jewish merchant princes, some of whom had already made their way to London. At this juncture, the English gave Jews full rights in the colony of Surinam, which they had controlled since 1650. There is some debate among historians, particularly Jewish theologian Ismar Schorsch, concerning whether or not Menasseh’s personal motives for pursuing the readmission of the Jews by England were primarily political or religious. Schorsch argues that the idea of England being a final place for Jews to inhabit in order to bring about the coming of the Messiah was hardly present in Hope of Israel, but rather was developed by Menasseh later in order to appeal to English Christians with Millenarian beliefs.[3]
Following the Irish uprising in 1641 and subsequent Cromwellian invasion, the English Parliament passed the Act for the Settlement of Ireland in 1652 which classified the Irish population into one of several categories according to their degree of involvement in the uprising and subsequent war. Those who had participated in the uprising or assisted the rebels in any way were sentenced to be hanged and to have their property confiscated. Other categories of the Irish population were sentenced to banishment with whole or partial confiscation of their estates. Whilst the majority of the resettlement took place within Ireland to the province of Connaught, Dr William Petty, Physician-General to Cromwell's Army, estimated that as many as 100,000 Irish men, women and children were transported to the colonies in the West Indies and in North America as slaves.[15] During the early colonial period, The Scots and the English, along with other western European nations, dealt with their "Gypsy problem" by transporting them as slaves in large numbers to North America and the Caribbean. Cromwell shipped Romanichal Gypsies as slaves to the southern plantations and there is documentation of Gypsies being owned by former black slaves in Jamaica.[16]
On the other hand, the worst atrocities committed in Ireland, such as mass evictions, killings and deportation of over 50,000 men, women and children as prisoners of war and indentured servants[54] to Bermuda and Barbados, were carried out under the command of other generals after Cromwell had left for England.[55] However other historians would argue that ultimately he was the commander of these generals. Some point to his actions on entering Ireland. Cromwell demanded that no supplies were to be seized from the civilian inhabitants and that everything should be fairly purchased; "I do hereby warn....all Officers, Soldiers and others under my command not to do any wrong or violence toward Country People or any persons whatsoever, unless they be actually in arms or office with the enemy.....as they shall answer to the contrary at their utmost peril." However it should be noted that he landed in Dublin, a city with no Catholic population as they had been previously expelled. Several English soldiers were hanged for disobeying these orders.
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