Tamír Triad Series by Lynn Flewelling

Sometimes the price of destiny is higher than anyone imagined....Dark Magic, Hidden DestinyFor three centuries a divine prophecy and a line of warrior queens protected Skala. But the people grew complacent and Erius, a usurper king, claimed his young half sister’s throne... moreSometimes the price of destiny is higher than anyone imagined....Dark Magic, Hidden DestinyFor three centuries a divine prophecy and a line of warrior queens protected Skala. But the people grew complacent and Erius, a usurper king, claimed his young half sister’s throne. Now plague and drought stalk the land, war with Skala’s ancient rival Plenimar drains the country’s lifeblood, and to be born female into the royal line has become a death sentence as the king fights to ensure the succession of his only heir, a son. For King Erius the greatest threat comes from his own line — and from Illior’s faithful, who spread the Oracle’s words to a doubting populace.As noblewomen young and old perish mysteriously, the king’s nephew — his sister’s only child — grows toward manhood. But unbeknownst to the king or the boy, strange, haunted Tobin is the princess’s daughter, given male form by a dark magic to protect her until she can claim her rightful destiny. Only Tobin’s noble father, two wizards of Illior, and an outlawed forest witch know the truth. Only they can protect young Tobin from a king’s wrath, a mother’s madness, and the terrifying rage of her brother’s demon spirit, determined to avenge his brutal murder.... less

The line of Skala's ruling queens was established in accordance with prophecy. But now King Erius reigns, and he is ruthless in his determination to rid of Skala of any threat to his grip on power. As the only living child of Erius's dead sister, Prince Tobin is second in line to the throne. But he is not what he seems. To protect him from the paranoid assassinations ordered by his uncle, Tobin's identity was disguised shortly after birth... moreThe line of Skala's ruling queens was established in accordance with prophecy. But now King Erius reigns, and he is ruthless in his determination to rid of Skala of any threat to his grip on power. As the only living child of Erius's dead sister, Prince Tobin is second in line to the throne. But he is not what he seems. To protect him from the paranoid assassinations ordered by his uncle, Tobin's identity was disguised shortly after birth. But now, with the onset of puberty, Tobin has discovered his true self -- she is the rightful heir to the throne. At court, Tobin and his loyal squire Ki form part of Crown Prince Korin's inner circle. Tobin is forced to live a lie, deceiving not only his potential enemies but also his closest friends. But soon the time will come when Skala will have need of her true Queen. And as plague ravages the land, ancient enemies threaten war and the wizards who have traditionally protected Skala are mercilessly persecuted, it seems that day may be drawing near. Tobin must be ready to reveal her true identity and serve her country, whatever the personal cost. less

Under the rule of a usurper king, the realm of Skala has suffered famine, plague, and invasion. But now the time for the rightful heir has come, a return to the tradition of warrior queens. And the Lightbearer's prophecy is to be upheld at last: so long as a daughter of the royal line defends and rules, Skala will never be subjugated... moreUnder the rule of a usurper king, the realm of Skala has suffered famine, plague, and invasion. But now the time for the rightful heir has come, a return to the tradition of warrior queens. And the Lightbearer's prophecy is to be upheld at last: so long as a daughter of the royal line defends and rules, Skala will never be subjugated.Now a mystical fire has burned away the male body known as Prince Tobin, revealing Princess Tamír, a girl on the verge of womanhood—and a queen ready to claim her birthright after a life in disguise under the protection of wizards and witches. But will her people, her army—and the friends she was forced to deceive—accept her? Worse, will the crown's rival heir, friend to Tobin, turn foe to Tamír, igniting civil war in a fierce battle for Skala? less