- Guido Ubaldus
"Guido Ubaldus" is an uncommon name for
Guidobaldo del Monte (1545 – 1607). It is sometimes confused with:*
Guido Grandi (1671 – 1742), a later Italian mathematician who studied the rose curve and 1 − 1 + 1 − 1 + · · ·
*Ubald (1100 — 1168), bishop of Gubbio and a Catholic saint
Wikimedia Foundation. 2010.