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In page Minervina:

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Crispus's year of birth is nowhere outright stated, she must have given birth to him before 307.[6] Constantine provided a formal education to his son and Crispus was elevated to the rank of princeps iuventutis as well as holding the office of Consul three times.[6] This may suggest that the marriage of Constantine and Minervina was a legal Roman marriage.[citation needed] When Constantine wanted to strengthen his alliance with the other Tetrarchs, in 307 AD he married Fausta, the daughter of the emperor Maximian. Minervina might have already been dead by 307, but it is possible that Constantine set her aside[3] or initiated a divorce with her. Minervina does not appear in the historical record after 307 AD.