It is unknown exactly when and how the Mausoleum came to ruin: Eustathius, writing in the 12th century on his commentary of the Iliad says "it was and is a wonder". Because of this, Fergusson concluded that the building was ruined, probably by an earthquake, between this period and 1402, when the Knights of St. John of Jerusalem arrived and recorded that it was in ruins.[8] However, Luttrell notes[9] that at that time the local Greek and Turks had no name for – or legends to account for – the colossal ruins, suggesting a destruction at a much earlier period.