 At Sedan Andrew Melville arrived in about 1612 from Scotland (via the Tower of London) and became a difficult colleague, sharing in the theology teaching.In April 1620 Tilenus set up, at L'Isle, near Orléans, a debate with John Cameron, on the conclusions at Dort.Cameron published his version as "Amica collatio de gratia et voluntatis humanae concursu in vocatione" (1622).