From the Introduction:
...traditionally, the three countries known as Eddia or Eddis, Attolia or Attolis, and Sounia or Sounis had chosen to ally with and against each other as the occasion demanded, and any alliance was likely to be temporary, formed on a military basis, and conducted through mid-level functionaries and generals rather than through the ruling house. However, during the Mede War and the subsequent Golden Age the three countries enjoyed an unusual closeness and mutual reliance that continued for many years despite earlier conflict.
This period of peace is attributed to many factors. Much credit is given to Attolis Eugenides, the Annux of the Golden Age. His ascension to the Attolian throne is popularly recognized as having a strong influence, as is the succession to the throne of the young heir of Sounis, who was friendly to the king of Attolia and served to mend the relationship between those two countries. Less often recognized is the strong personal relationship between the 14th Queen of Eddis, commonly referred to as Eddis Thēlykό , and the 16th Queen of Attolia, commonly referred to as Attolia Έndoxē , that was the true basis for the decades-long alliance between the two nations. The world had never before seen such a partnership, and may not again. It was an alliance unmatched in scope, in its beginnings, and in its particulars. Perhaps most remarkably, the connection was not only political, but a closely personal relationship.
This friendship has rarely been explored in depth in the study of history, and this work aims, among other things, to rectify this imbalance.
 from the word “θηλυκό”, meaning “female”, a reference to her status as the first and final female ruler of the country to take the title “Eddis” instead of “Eddia”
 from “ένδοξη”, meaning “glorious”