Arnold of Rotterdam (or of Holland)

a Dutch theologian, was also called Geilhoven. He studied .at. Bolognia and Padua, and became doctor of canonical law. He died Aug. 31, 1442.. He wrote, Γνῶθι σεαυτόν, or Speculum Conscientice, in two books-the first entitled De Legibus et Statutis; de Peccatis Mortalibus, written in 1413:-the other, De Excommunicatione et aliis Censuris, written in 1424., This. book is still known under the odd title of Gnotosolitos, and was published at Brussels in 1479. See Hoefer, Nouv. Biog. Generale, s. v;