For beginners, 'Pride and Prejudice' is a great start. It's easy to understand and the language, while period - appropriate, is not overly difficult. The story of Elizabeth and Darcy's love is very charming. Another good option is 'The Notebook' by Nicholas Sparks. Set in a more recent historical period, it tells a simple yet deeply moving love story that many find accessible.
A good beginner - friendly romantic historical novel is 'Jane Eyre' by Charlotte Bronte. It's a story of a young governess, Jane, and her relationship with Mr. Rochester. The historical context of Victorian England is well - presented, and the love story is both passionate and morally complex. Also, 'Romeo and Juliet' by Shakespeare, although a play, is a classic and very accessible in terms of understanding the basic romantic plot set in Verona's historical setting.