what are all the religions in which ambrose of siena and john of perugia and peter of sassoferrato are important ?
SELECT DISTINCT var_uri where brack_open dbr_Ambrose_of_Siena dbp_veneratedIn var_uri sep_dot dbr_John_of_Perugia_and_Peter_of_Sassoferrato dbp_veneratedIn var_uri brack_close