Question: Who was born later, Sibylle of Cleves or Oona O'Neill?
Sentence (from "Sibylle of Cleves"): Cleves, Berg "jure uxoris", Count of Mark, also known as de la Marck and Ravensberg "jure uxoris" (often referred to as Duke of Cleves) who died in 1538, and his wife Maria, Duchess of Julich-Berg (1491–1543).
Relevant evidence: No