Abridgment

Johannes’s Epitome

of Königsberg Johannes de Monte Regio (1436–1476), better known as Regiomontanus, was the preeminent mathematician and astronomer of the 15th century. "Monte Regio" is the Latin translation of his hometown, Königsberg. on the

Almagest AlmagestThe "Almagest" was the most influential astronomical work of antiquity. Written by Claudius Ptolemy in the 2nd century, it established the geocentric model (Earth-centered) that dominated scientific thought for over 1,400 years. of Ptol-

emy

Most noble Lord original Spanish: "muy noble Sen̄or"

The lower half of the page features several faint, large calligraphic characters—specifically the letters C, E, L, and R. These appear to be pen trials, where a reader or scribe tested the flow of their ink and the sharpness of their quill on the flyleaf or title page of the book.