The earliest leader of the strict party was Brother Leo a strong polemic against the laxer party .
Brother Leo is the witness of the ecstasies of Francis on Monte Alverno and the author of the Speculum perfectionis .
The earliest leader of the strict party was Brother Leo , the witness of the ecstasies of Francis on Monte Alverno and the author of the Speculum perfectionis , a strong polemic against the laxer party .