Ad Ducissam Brabantiae (rescripta) by De regimine principum ad regem Cypri et De regimine Judaeorm ad Ducissam Brabantiae; politica opuscula duo ad fidem optimarum editionum diligenter recusa Joseph Mathis curante.Full title: Epistola ad ducissam Brabantiae. Other titles: Epistola ad Comitissam Flandriae. It is believed by many this letter was likely written in 1271, not to the “Duchess of Brabant” (as many historians, and even the Leonine editors thought), but rather to Margaret, Countess of Flanders, who had a great interest in the Dominican Order, and likely knew Thomas directly. On the Government of Jews in Aquinas. Translated by J. G. Dawson in Aquinas: Selected Political Writings , pp. 84 – 95; Text in Latin can be found in the Leonine edition of Opera Omnia, vol. 42, pp. 357-378.