The Future King's Pregnant Mistress by Penny Jordan

As the king ails, it's time for his heir Marco to claim his rightful place on the throne of Niroli! The playboy prince is used to everyone obeying his every command...especially the women he beds.

Emily Woodford loves Marco, but has no idea he's a royal prince. What's more, when she discovers the truth, she's devastated to realise that Marco only sees her as his mistress. But what will this king–in–waiting do when he discovers his mistress is pregnant?

Surgeon Prince, Ordinary Wife by Melanie Milburne

Prince Alessandro Fierezza was snatched as a baby, held for ransom by ruthless Vialli bandits and was believed to be dead. But when brilliant Australian surgeon Dr Alex Hunter arrives on Niroli to help the ailing king, rumours abound that he is the missing prince!

Amelia Vialli is a dedicated nurse, serving the poor of Niroli. Unaware of the gossip that surrounds Dr Hunter, she immediately falls under his spell. But when Alex discovers Amelia's secret, he's torn between duty to the ruling family, and his passion for an ordinary woman who can never be his queen