οἱ τότε ἤρχοντο εἰς τὴν νῆσον → they were then coming to the island
fulcīmentum: i, n. id.,I a prop, stay, support (post-class.), App. M. 1, p. 109 med.; Macr. S. 7, 9; Dig. 33, 7, 12, § 19.
fulcīmentum, ī, n. (fulcio), soutien, appui, étai : Apul. M. 1, 16 ; Macr. Sat. 7, 96.