The 'A Song of Ice and Fire' series (the first three books can be considered as a trilogy in a sense). George R.R. Martin creates a complex and detailed world inspired by medieval history. There are numerous political intrigues, battles, and a large cast of characters. 'The Anne of Green Gables' trilogy is also a great choice. Set in Canada in the late 19th and early 20th centuries, it follows the life of Anne Shirley, a young orphan girl. It shows the rural life, family values, and the growth of a girl in that era. And 'The House of Niccolo' trilogy by Dorothy Dunnett. It is set in the 15th - century Europe and follows the adventures of Niccolo, a merchant - adventurer. It has detailed historical settings, complex plots, and well - developed characters.
One of the best historical trilogy novels is 'The Baroque Cycle' by Neal Stephenson. It delves into the late 17th and early 18th centuries, with complex plots involving science, politics, and international intrigue. The characters are vividly drawn, and Stephenson's detailed research shines through. 'The Millennium Trilogy' by Stieg Larsson is also notable. It features the character of Lisbeth Salander, a brilliant but troubled hacker, and Mikael Blomkvist, a journalist. They get involved in a web of mystery, corruption, and crime. And 'The Hunger Games' trilogy, while set in a dystopian future which has some historical elements in terms of how society has developed, with themes of power, survival, and revolution.
The 'Texas Trilogy' by Sandra Brown is another option. It takes place in Texas during a historical period. The novels are filled with complex characters and passionate romances, all set against the backdrop of the unique Texas landscape and culture.
The 'Wallflowers' series by Lisa Kleypas can be considered. It's a set of four books that are somewhat of a trilogy plus one. These novels are set in the Victorian era and feature strong - willed heroines and charming heroes. The romances are complex and the historical details of the era, like the social mores and fashion, are well - presented.
Complex characters are also common. The heroines are usually strong - minded in a time when women had less power. Take Scarlett O'Hara in 'Gone with the Wind' (which could be considered part of a trilogy if you count the related books). She's a very complex character with her own desires and struggles in the historical context of the American Civil War.
The Lord of the Rings by J.R.R. Tolkien is a very popular historical trilogy novel. It takes place in a fictional Middle - earth and has a rich history and lore. Another one is His Dark Materials by Philip Pullman, which is set in a parallel universe with its own historical and theological elements. Also, The Millennium Trilogy by Stieg Larsson is well - known, dealing with contemporary and historical issues in Sweden.
The 'Bridgerton' series books could be seen as a great romantic trilogy. It's set in the Regency era and is filled with courtship, scandal, and love. The relationships are complex and the characters are well - developed. There are balls, secrets, and lots of flirting which make the romantic stories engaging.
The 'Percy Jackson and the Olympians' trilogy by Rick Riordan. It combines Greek mythology with modern - day settings. Percy, the main character, discovers he is a demigod and goes on all sorts of adventures with his friends, facing mythical monsters and gods. It's a really fun and educational read for young adults.
There is the 'Neapolitan Novels' by Elena Ferrante which can be considered as a kind of historical fiction trilogy. It follows the lives of two women from Naples, Italy, starting from their childhood in the post - World War II era. It shows the social, cultural, and political changes in Naples over the years through their experiences. The books are known for their in - depth exploration of female friendship and the Italian society of that time.
One of the best is 'The Notebook' trilogy by Nicholas Sparks. The Notebook itself is a very well - known and heart - warming love story. The sequels also explore different aspects of love and relationships in a very engaging way.
The 'Fifty Shades' trilogy was very popular, but it contains some adult themes. So, instead, consider the 'Outlander' trilogy by Diana Gabaldon. It combines historical elements with a great love story. The relationship between Claire and Jamie is complex and deeply romantic, spanning different time periods and facing various challenges.