Giovanni di Strassoldo writes in a letter to Giovanni Antonio Magini the following: << Valentinus Nabodus Exphardiensis matheseos professor doctissimus in Accademia Coloniensi, natus anno 1523, 13 Februarij, Hor. 18, min. 32. Mercurium habuit iunctum Lunae in Aquario domo 12ma >> le hore s'intendono P.M. [1] According to AstrowikiHor. 18, min. 32. P.M. should be counted from noon February 13, meaning that Naboth was actually born 6:32 A.M. February 14, Valentine's Day.
The student Matrikel of Wittenberg[3] has the following entry: Valentinus Neboth Kalensis. Gratis inscripsi. Anfang 1544, while the Matrikel of Erfurt[4] has: Valentinus Naboth Callensis. 'Calensis' stands for 'from Calau'. Furthermore, in the introduction to his book De calculatoria numerorumque natura Sectiones quatuor (1556) Naboth identifies himself as Valentinus Nabodus Lusitanus, i.e. 'from Lusatia'.
Meuthen, Erich (1988). Kölner Universitätsgeschichte: Die alte Universität. Volume 1 of Kölner Universitätsgeschichte (in German). Böhlau. pp. 286–287. ISBN3-412-06287-1. OCLC180392627.{{cite book}}: CS1 maint: location missing publisher (link)
Proxenus ze Sudetu, Šimon (1979). Martínková, Dana (ed.). Commentarii de itinere Francogallico. Bibliotheca scriptorum Medii Recentisque Aevorum, ser. nova, t. 5 (in Latin). Budapest: Akadémiai Kiadó. ISBN963-05-1843-0. OCLC7736635.
Secret, François (1998). Postel revisité: nouvelles recherches sur Guillaume Postel et son milieu (in French). Paris: S.É.H.A. ISBN88-7252-187-4. OCLC123291208.