Honorius was convinced by the minister Olympius that Stilicho was conspiring to overthrow him, and so arrested and executed Stilicho in 408. Olympius headed a conspiracy that orchestrated the deaths of key individuals related to the faction of Stilicho, including his son and the families of many of his federated troops. This led many of the soldiers to instead join with Alaric, who returned to Italy in 409 and met little opposition. Despite attempts by Honorius to reach a settlement and six legions of Eastern Roman soldiers sent to support him, the negotiations between Alaric and Honorius broke down in 410 and Alaric sacked the city of Rome. Though the sack was relatively mild and Rome was no longer the capital of even the Western Empire, the event shocked people across both halves of the Empire as this was the first time Rome (viewed at least as the symbolic heart of the Empire) had fallen to a foreign enemy since the Gallic invasions of the 4th century BC. The Eastern Roman Emperor Theodosius II, the successor of Arcadius, declared three days of mourning in Constantinople.