
This week's letter is "K." So I went to my shelves, and this is what I pulled out.

Katherine
Written by Anya Seton
First published 1954
Written by Anya Seton
First published 1954
Description from the publisher:
This classic romance novel tells the true story of the love affair that changed history – that of Katherine Swynford and John of Gaunt, Duke of Lancaster, the ancestors of most of the British royal family. Set in the vibrant 14th century of Chaucer and the Black Death, the story features knights fighting in battle, serfs struggling in poverty, and the magnificent Plantagenets – Edward III, the Black Prince, and Richard II – who ruled despotically over a court rotten with intrigue. Within this era of danger and romance, John of Gaunt, the king's son, falls passionately in love with the already married Katherine. Their well-documented affair and love persist through decades of war, adultery, murder, loneliness, and redemption. This epic novel of conflict, cruelty, and untamable love has become a classic since its first publication in 1954.The book's page at Amazon.com.
The Wikipedia article about the book.
The original cover from 1954:

And the cover of a more recent edition:

This is another book I haven't read yet, although I've skimmed through sections of it. Katherine (de Roet) Swynford is supposed to be an ancestress of mine, so I've always been interested in her, and the children she had with John of Gaunt. Those Plantagenets were so colorful, but so hard to keep track of!