 | 57. Henry Sumner Maine, Dissertations on Early Law and Custom (New York: H. Holt and Company, 1886), p. 365.
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 | 58. Herbert Felix Jolowicz, Roman Foundations of Modern Law (Oxford: Clarendon Press, 1957), pp. 6667.
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 | 59. Sophocles, Antigone 450457.
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 | 60. D'Entrèves, Natural Law , p. 34.
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 | 61. Cicero, De legibus 1.10.29; 12.33 (tr. Keyes).
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 | 62. Occasionally slavery is defined as an institution of the ius gentium contrary to Nature and resulting from war, e.g. Institutes 1.2.2: "Slavery is contrary to natural law, because by nature all men are born free at the beginning": Servitutes, quae sunt iuri naturali contrariae (iure enim naturali ab initio omnes homines liberi nascebantur ).
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 | 63. Aristotle, Nicomachaean Ethics 1134b1819 (5.7.1).
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 | 64. Herbert Felix Jolowicz, Historical Introduction to the Study of Roman Law (Cambridge: University Press, 1932), p. 105.
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 | 65. Jolowicz, Roman Foundations of Modern Law , p. 113.
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 | 66. Digest 25.4.1.1; 35.2.9.1. But n.b. 50.16.153. See also Jolowicz, Roman Foundations of Modern Law , p. 109.
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 | 67. Declareuil, Rome the Law-Giver , p. 190.
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 | 68. Nicholas, Introduction to Roman Law , p. 98.
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