At Pavia in 1018 (or 1022 according to some authorities) was mainly concerned with the issue of decrees against clerics who lived with wives or concubines and bestowed Church goods on their children.
Prices are reckoned out in numbers of such slaves and there must have been a constant call for them both as concubines and as household servants.
During the bitter conflict between laws which forbade sacerdotal marriages and long custom which had permitted them, it was natural that the legislators and the ascetic party generally should studiously speak of the priests' wives as concubines, and do all in their power to reduce them to this position.
Was compelled to decide that priests who had kept two or more concubines, successively or simultaneously, did not thereby incur the disabilities which attended digamists; or, in other words, that a layman who had contracted two lawful marriages and then proceeded to ordination on the death of his second wife, could be absolved only by the pope; whereas the concubinary priest, "as a man branded with simple fornication," might receive a valid dispensation from his own bishop (Letter to archbishop of Lund in 1212.
Cardinal Pierre d'Ailly pleaded before the council of Constance in 1415 for the reform of "that most scandalous custom, or rather abuse, whereby many [clergy] fear not to keep concubines in public."