Patarine
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A Patarine or Patarene (Italian: Patarino, plural Patarini) was a member of an 11th century group of Milanese tradesmen.
The patarini supported the reforming Popes of the 11th century. They led opposition to simony, clerical marriage and concubinage in Milan. The name patarini was given them by their opponents and means "ragpickers". The conflict between the patarini and their suppurters and those in favour of the simoniac archbishop eventually led to civil war in the mid 1070s.
See William Chester Jordan's Europe in the High Middle Ages (Penguin Books 2001) pp 90-93 for a full account of this part of the investiture conflict.