the Roman Senate deteriorated due to a presumed senatorial conspiracy in 522, and, in 523, Theodoric had the philosopher and court official Boethius and Boethius' father-in-law Symmachus arrested on charges of treason related to the alleged plot. For his role, Theodoric had Boethius executed in 524. Despite the complex relationship between Theodoric and his son-in-law, the Catholic Burgundian king Sigismund, the two enjoyed a mutual peace for fifteen years. Then in 522, Sigismund killed his own son—Theodoric's grandson—Sigeric; an act which infuriated Theodoric and he retaliated by invading the Burgundian kingdom, accompanied by the Franks. Between the two peoples, Sigismund's Burgundian forces faced two fronts and were defeated. Meanwhile, Sigismund's Arian brother Godomar established himself as king over the remaining Burgundian territory and ruled for a decade. When Theodoric's sister Amalafrida sought to possibly change the direction of Vandal succession following the death of her spouse, the former Vandal king Thrasamund, the new Catholic Vandal king Hilderic had her, along with the accompanying Gothic retinue, killed. Theodoric was incensed and planned an expedition to restore his power over the Vandal kingdom when he died of dysentery in the summer of 526. The Gothic king was succeeded by his grandson Athalaric, with Theodoric's daughter Amalasuintha serving as regent since Athalaric was but ten years of age when Theodoric died. Her role was to carry out the dead ruler's political testament, to seek accommodation with the senate, and maintain peace with the emperor. Suddenly the once united Goths were split and Theodoric's grandson Amalaric ruled the newly independent Visigothic kingdom for the next five years. Family and progeny Theodoric was married once. He had a concubine in Moesia, name unknown, with whom he had two daughters: Theodegotha (ca. 473 – ?). In 494, she was married to Alaric II as a part of her father's alliance with the Visigoths. Ostrogotho (ca. 475 – ?). In 494 or 496, she was married to the king Sigismund of Burgundy as a part of her father's alliance with the Burgundians. By his marriage to Audofleda in 493 he had one daughter: Amalasuintha, Queen of the Goths. She was married to Eutharic and had two children: Athalaric and Matasuntha (the latter being married to Witiges first, then, after Witiges' death, married to Germanus Justinus; neither had children). Any hope for a reconciliation between the Goths and the Romans in the person of a Gotho-Roman Emperor from