The measures proposed included the settlement of the province of Leinster by "English lords and gentlemen", the securing of castles and other strongholds, and more controversially, the suppression of all monasteries, which he regarded as potential centres of rebellion. He did not urge the expulsion of the native Irish people, arguing that they would be a useful element in society if properly governed.[5] The "Breviat" probably built on an earlier treatise, "The Decay of Ireland" (1515), by Sir William Darcy, the long-serving Vice-Treasurer of Ireland.