Editor of DKAR 1:58 identifies Monnet as in arrondisement of Beaugé/Baugé, which was abolished in 1926. Editor of cartulary of Saint-Aubin identifies Multonacus as Monnet in commune of Beaufort-en-Vallée (formerly in arrondisement of Beaugé).
According to French Wikipedia, the modern commune consists of three villages: Pruniers, Bouchemaine et la Pointe. Editor of DKAR 1:58 identifies Pruniers with Prunarius.
Editor of DKAR 1:58 identifies as Papillaie in commune of Angers; modern location not identified.
Appears in DKAR 1:58; probably in region of Angers.
Island near Angers, identified by editor of DKAR 1:58 as Gilettes. Editor of cartulary of St-Aubin says it is opposite La Baumette (SW quarter of Angers, on banks of Lac de Maine). Not so far located via Geonames, Google Maps or OpenStreetMap.