Immediately after Hadrian's death, Antoninus approached Marcus and requested that his marriage arrangements be amended: Marcus's betrothal to Ceionia Fabia would be annulled, and he would be betrothed to Faustina, Antoninus's daughter, instead. Faustina's betrothal to Ceionia's brother Lucius Commodus would also have to be annulled. Marcus consented to Antoninus's proposal. He was made consul for 140 with Antoninus as his colleague, and was appointed as a "seviri", one of the knights' six commanders, at the order's annual parade on 15 July 139. As the heir apparent, Marcus became "princeps iuventutis", head of the equestrian order. He now took the name Marcus Aelius Aurelius Verus Caesar. Marcus would later caution himself against taking the name too seriously: 'See that you do not turn into a Caesar; do not be dipped into the purple dye – for that can happen'. At the senate's request, Marcus joined all the priestly colleges ("pontifices", "augures", "quindecimviri sacris faciundis", "septemviri epulonum", etc.); direct evidence for membership, however, is available only for the Arval Brethren.