Welsh Princes Series by Sharon Kay Penman

1
Thirteenth-century Wales is a divided country, ever at the mercy of England's ruthless, power-hungry King John. Then Llewelyn, Prince of North Wales, secures an uneasy truce with England by marrying the English king's beloved, illegitimate daughter, Joanna. Reluctant to wed her father's bitter enemy, Joanna slowly grows to love her charismatic and courageous husband who dreams of uniting Wales. But as John's attentions turn again and again to subduing Wales--and Llewelyn--Joanna must decide to which of these powerful men she owes her loyalty and love.
A sweeping novel of power and passion, loyalty and lives, this is the book that began the trilogy that includes FALLS THE SHADOW and THE RECKONING

2
"A marvelous literary and historical achievement...Impossible to put down."
THE BOSTON HERALD
This is Simon de Montfort's story--and the story of King Henry III, as weak and changeable as Montfort was brash and unbending. It is a saga of two opposing wills that would later clash in a storm of violence and betrayal, a story straight from the pages of history that brings the world of the thirteenth century completely, provocatively, and magnificently alive. Above all, this is a story of conflict and treachery, of human frailty and broken legends, a tale of pageantry and grandeur that is as unforgettable as it is real....

3
"Penman's characters are so shrewdly imagined, so full of resonant human feeling that they seem to be on the page....Most compelling is the portrait of the Welsh as wild and rugged as their landscape."
SAN FRANCISCO CHRONICLE
Here, alive from the pages of history, is the compelling tale of a Celtic society ruled by Llewelyn, Prince of Wales, on a collison course with a feudal realm of Edward I. WIth this last book in the extraordinary trilogy that began with HERE BE DRAGONS and continued in FALLS THE SHADOW, Sharon Kay Penman has written a beautiful and moving conclusion to her medieval saga. For everyone who has read the earlier books in this incomparable series or ever wanted to experience the rich tapestry of British history and lore, this bold and romantic adventure must be read.