Caesarius of Aries: Rule for Nuns (ca. 512-534)
And, if it can be done, even with difficulty, no little girl shall ever be taken into the monastery, until she is six or seven years old, able
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to learn to read and write and to obey the rules. Girls, whether they are the daughters of nobles or of commoners, are definitely not to be received for the purpose of raising or teaching them.