Possible Clues:

• Knowles, ex-Spurs and England left-back
• Washbrook
• Reputed saintly inventor of the Russian alphabet
• Actor Ritchard or Cusack
• Saint said to have created the Russian alphabet
• Slavic saint
• St -- of Alexandria, Greek theologian and Doctor of the Church
• South African president ___ Ramaphosa
• Cy, formally
• Saint with an alphabet named after him