Ah Roberta Gellis! I might never, ever have developed a taste for history without you!
Honestly, in school there was never a single teacher who managed to captivate me with History, but as a very early teenager I came across a novel by Gellis and was hooked for life. Her depictions of the Angevin period of English history enchanted me and the romances of the Roselynde Chronicles became a staple for me. Still are in a way.
In The Sword and the Swan, if you can get past the ludicrous name, one gets a pleasant historical fiction, with a tiny dash of kind-off romance, and a slightly earlier taste of history.
Gellis wrote TSATS around the time she was beginning the Roselynde Chronicles, but I think her writing evolved a fair bit between this book and those in a few important ways. Namely, she managed to make the Roselynde women far more readable for a modern taste without completely sacrificing history. In TSATS however our leading lady is less distinct a character and less modern. She is more pliable, probably more historically accurate, but Catherine does not hook the reader as much as the Roselynde women did. Likewise her husband Rannulf of Sleaford also does not have the strong dynamic character of the men in the Roselynde's, though you can see how he may have evolved into a template for them.
In an historical sense, we are a few decades earlier then the Roselynde books as the events take place toward the end of the reign of Stephen of Blois, so the 1150's. This period is apparently known as The Anarchy in England and, as Henry I died without an heir, Empress Matilda tried to gain control of the land while Stephen took it in a coup. It was not a settled time for the land and I have read other books set in that time frame. While I enjoyed the time I was reading in it again, did not seem as vivid as other books of Gellis' that I had read. In therms of the politics, fighting and power mongering I chiefly found it interesting - once again - to see it as the forerunner of other books I enjoyed more.
So, not a bad book, overall. It suffers badly for being compared to later books and as Gellis' writing continued to improve throughout her life that is a hard act to follow. If I had encountered this one before her other books I suspect that I would have been blown away with enthusiasm.