Question: Who is John Of Caesarea's paternal grandmother?
Answer: Juliana Grenier

1180 – 24 June 1229), was the Constable of the Kingdom of Cyprus from 1206 and Lord of Caesarea in the Kingdom of Jerusalem from 1216. He was the eldest son of Juliana Grenier, Lady of Caesarea, and Guy de Brisebarre. Since he was witnessing royal charters by 1195, he must have been born no later than 1180