Then Lysimachus made war against his neighbours, first the Odrysae, secondly the Getae and Dromichaetes. Engaging with men not unversed in warfare and far his superiors in number, he himself escaped from a position of extreme danger, but his son Agathocles, who was serving with him then for the first time, was taken prisoner by the Getae. Lysimachus met with other reverses afterwards, and attaching great importance to the capture of his son made peace with Dromicliaetes, yielding to the Getic king the parts of his empire beyond the Ister, and, chiefly under compulsion, giving him his daughter in marriage. Others say that not Agathocles but Lysimachus himself was taken prisoner, regaining his liberty when Agathocles treated with the Getic king on his behalf. On his return he married to Agathocles Lysandra, the daughter of Ptolemy, son of Lagus, and of Eurydice.