What is "ildefonsus"

Saint Ildefonsus or Ildephonsus (rarely Ildephoses or Ildefonse; Spanish San Ildefonso; born circa 607, died 23 January 667) was a scholar and theologian who served as the metropolitan bishop of Toledo for the last decade of his life. His Gothic name was Hildefuns.

Although his writings were less influential outside of Hispania, Ildefonsus was canonised and remained a potent force in the peninsula for centuries. Spanish and (to a lesser extent) Portuguese missionaries spread his cult worldwide.