From king's ships to permanent purpose-built warships

What are early examples of dedicated royal warships that served beyond a single campaign?

The Mary Rose and Great Harry are examples, though the firm distinction between purpose-built warships and convertible merchant ships developed gradually.

The Mary Rose and Great Harry are documented king's ships, although a durable divide between warship and merchant ship took time to emerge. Into the seventeenth century, a merchant hull might become a fighting ship through modification, and the reverse could also occur. A later comparison places Great Harry in the same broad generation and design milieu as the large Spanish ships used around the Armada era. Permanent fleets emerged through this overlap in institutions and ship design.