A recurring complaint in the highly polemical chronicles of the medieval Veneto is that elite families misused marital alliances as instruments of political violence. This concern appears, in particular, in the Cronica in factis et circa facta Marchie Trivixane , by Rolandino da Padova , the most rhetorically coherent and thorough medieval history of the region. Rolandino's interest in abuses of the betrothal system is evident in his account of the serial marriages of Cunizza da Romano. Over fifty years before (...) Cunizza's posthumous celebration in Dante's Divine Comedy, Rolandino's discussion of her amours forms part of a long denunciation of her brother, Ezzelino III da Romano . Cunizza's brother was an imperial vicar who, at the height of his power, controlled the entire mainland of the Veneto, called the Marca Trevigiana in the Middle Ages. The powerful Ezzelino is implied in the chronicle to have manipulated Cunizza's marital alliances, and the suggestion is that the resulting strategic connections enabled him to foment war and injustice. This tale is but one of many in which the chroniclers of the region condemn elite marital practices deemed transgressive in terms of political oppression. The main purpose of this article is to chart the chroniclers' accusations that link misconduct in marriage agreements to violence in factional politics and abuse of power. I contend that the chronicles of the medieval Veneto represent tyranny in terms of the manipulation of marital alliances. (shrink)