Illibata dei Virgo Nutrix Easter Egg - Acrostic

The following is the first part of Josquin Desprez's "Illibata Dei Virgo Nutrix".

Illibata Dei virgo nutrix
Olimpi tu regis o genitrix
Sola parens verbi puerpera
Que fuisti Eve reparatrix
Viri nephas tuta mediatrix
Illud clara luce dat scriptura
Nata nati alma genitura
Des ut leta musorum factura
Prevaleat ymis et sit ave
Roborando sonos ut gluttura
Effligitent laude teque pura
Zelotica arte clament Ave

Okay. No big deal, right? Well, look down the side, to find an acrostic: Iosqvin (Des)Prez.

Josquin didn't put his own name in the text- the words were written for him by an unknown source.