The third part of the canon was widely used and commented in regard to the issue of "private churches" in the Iberian Peninsula. The secondary literature on the topic is very vast. For a short survey of (mainly Spanish) historiography see (Rodriguez Gil 1999: 247-272).
The present canon refers to Canon 27 of the council of Agde in AD 506 [939] and Canon 19 of the council of Orleans in AD 511.