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Plagiarism?

This source, which is from Medieval Italy: an Encyclopedia,""  ed. Christopher Kleinhenz, has been plagiarized, or nearly so, in a version of this article. Take this old version of the article as a reference point, and compare the following (emphasis added by me):

Dionigi di Borgo San Sepolcro (born circa 1300, died 1342) was from Sansepolcro near Arezzo. (Wikipedia)
Dionigi (c. 1300–1342) was born in Sansepolcro, near Arezzo. (Medieval Italy)

He was an Augustinian scholar of very keen intellect and was much sympathetic towards others. (Wikipedia)
He entered the Augustinian order at a young age and immediately distinguished himself by his keen intellect and piety. (Medieval Italy)

Dionigi was a scholar trained as an astrologer in Sorbonne as well as a theologian. He received his doctorate circa 1324. (Wikipedia)
He studied theology at the Sorbonne in Paris and received his doctorate c. 1324. (Medieval Italy)

One of Dionigi's works (which since has been lost) is his commentary (circa 1339–1342) on Valerius Maximus’s Factorum et dictorum memorabilium libri. (Wikipedia)
Almost all of Dionigi’s own writing has been lost. His most
famous work is his commentary (probably c. 1339–1342) on
Valerius Maximus’s Factorum et dictorum memorabilium libri. (Medieval Italy)

It became a template for subsequent commentaries on Valerius Maximus and also for several of Boccaccio’s reference works such as Esposizioni and Genealogia deorum gentilium.  (Wikipedia)
This commentary, with its many citations of classical authors, became a template not only for subsequent commentaries on
Valerius Maximus but also for several of Boccaccio’s nonfictional works, such as Esposizioni and Genealogia deorum gentilium. (Medieval Italy)

Another of Dionigi’s writings is a commentary on the first book of the Sententiae (a treatise on logic) and still another is a commentary on the pseudo Aristotelian Oeconomia'. (Wikipedia)
 Dionigi’s other writings include a commentary on the first book of the Sententiae, a treatise on logic, and a commentary on the pseudo-Aristotelian Oeconomia. (Medieval Italy'')

And that's just the first two paragraphs of that version of the WP article. In my opinion, this is a clear-cut case of plagiarism and a violation of copyright. Some of this remains in the article, some has been altered; but there's obviously a larger concern of whether there are other instances of plagiarism in the article. I'm not sure how to proceed.   "