Who was the first English King to speak English as his first language?

Prior to 1066, the English kings spoke some local Saxon dialect, after the Norman invasion the nobility generally spoke (and considered themselves) French. Many did learn to speak and understand the English spoken by their subjects and by the 14th century, most were fluent in French and Middle English. In 1362, the Statute of Pleading made English the official language for Parliament which meant that all nobles and the king spoke English well enough to conduct official business. Henry IV was the first English king to speak English as his first language. His son, Henry V was the first to use English in personal communications.