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In page Clare of Assisi:

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Clare was canonized on 26 September 1255 by Pope Alexander IV,[1][2] and her feast day was immediately inserted in the General Roman Calendar for celebration on 12 August, the day after her death, as 11 August was already assigned to Saints Tiburtius and Susanna, two 3rd-century Roman martyrs. The celebration was ranked as a Double (as in the Tridentine calendar) or, in the terminology of 1960, a Third-Class Feast (as in the General Roman Calendar of 1960). The 1969 calendar revision deleted the feast of Saints Tiburtius and Susanna from the calendar, and moved the memorial of Saint Clare to be celebrated on 11 August, the anniversary of her death.[citation needed]