The predominant theory sides with his epithet, claiming that he was born in Lacedaemon.
[2][3][4][5] There is evidence however, that he may have been born in Ilium or Elis as stated by competing testimony from Diodorus.
[6][7] Sosylus accompanied Hannibal during the Second Punic War and is the author of the Deeds of Hannibal, a lost historical work of seven volumes; only fragments of the work are known.
[6][5][8][9][10] It is often assumed that Sosylus only recounted the first part of the war due to Battle of Ebro River being recorded in the fourth volume of the work.
[11] Sosylus taught Hannibal Greek, while also recording the events of the war.