pataria

thumb|The murder of Arialdo da Carimate, part of the conflict of the pataria The pataria was an eleventh-century Catholic movement focused on the city of Milan in northern Italy, which aimed to reform the clergy and ecclesiastic government within the city and its ecclesiastical province, in support of papal sanctions against simony and clerical marriage. Those involved in the movement were called patarini (singular patarino), patarines or patarenes, a word perhaps chosen by their opponents, the etymology of which is uncertain. The movement, associated with urban unrest in the city of Milan, is generally considered to have begun in 1057 and ended in 1075. The movement failed to achieve its goal.

The name Patarenes has also been used for the unconnected earlier Bogomils and the later Albigensians or Cathars, who in contrast were anti-papal and non-Catholic. These were declared heretical sects. They are considered by some as a precursor to the Protestant Reformation, however some sources fail to differentiate these different groups.