In the era of 448 [410 C.E.], the seventeenth of Honorius’ rule and the first of Theodosius II, when Alaric had died after the city [of Rome] was captured, Athaulf was put into power as king of Italy by the Goths for the next six years. In the fifth year of his reign he left Italy and went to Gaul, where he took Placidia, Emperor Theodosius’ daughter whom the Goths had captured at Rome, as his bride. Some believed that this fulfilled the prophecy of Daniel, who said that the daughter of the king of the South would be married to the king of the North, but without any offshoot from her line surviving. And just so, that same prophet adds in the following, “And her offspring will not endure.” And she bore no son who might succeed the father in his rule. Then Athaulf, after he left Gaul and while he was heading for Spain, had his throat cut by one of his own men during a friendly conversation at Barcelona.
Aera CDXLVIII, anno imperii Honorii XVII, et primo Theodosii Minoris, Alarico post captam Urbem defuncto, Athaulfus a Gothis Italiae regno praeficitur annis VI. Iste, quinto regni anno de Italia recedens, Gallias adiit, Placidiam Theodosii imperatoris filiam, quam Romae Gothi ceperant, conjugem sibi assumpsit. In qua prophetia Danielis a quibusdam creditur fuisse completa, qui ait filiam regis Austri conjungendam regi Aquilonis, nulla tamen de germine ejus sobole subsistente. Sicut, et idem in sequentibus propheta subjungit dicens: Nec stabit semen ejus [Dan 11.6]. Nullus enim de utero illius exstitit genitus, qui patris in regno succederet. Athaulfus autem dum, relictis Galliis, Hispanias peteret, a quodam suorum apud Barcinonam inter familiares fabulas jugulatur.
—Isidore of Seville, Historia de regibus Gothorum, Vandalorum et Suevorum 19