Mordrellen Mantear was the High Seat of House Mantear in Andor, which by the 960s NE had become the ruling house of the kingdom. Mordrellen sat the Lion Throne in the city of Caemlyn and ruled over the most powerful and populous kingdom in the Westlands as Queen. It is not known how long Mordrellen ruled. It is known that one of the oldest and most respected Aes Sedai of her time, Gitara Moroso, was appointed to Mordrellen to serve as her advisor.
The alliance with Cairhien
In 965 NE, the newly-crowned King Laman Damodred of Cairhien prosecuted a war with Andor for reasons that are not entirely clear, but possibly related to trade along the River Erinin. In 968 NE Mordrellen and Laman concluded a peace treaty. As part of that treaty, Laman's nephew and heir Taringail would wed Mordrellen's daughter, Tigraine, the heir to the Lion Throne. Although the treaty ended the war, the marriage was not a happy one; it is unknown if Mordrellen was aware of how miserable her daughter was in the relationship.
In 971 NE, Mordrellen's son Luc disappeared before his formal recognition as the First Prince of the Sword of Andor. On the advice of Gitara Moroso, he journeyed north to the Borderlands and took part in a raid into the Great Blight, but was not seen again. Mordrellen and Tigraine were both heartbroken.
In the spring of the following year, after giving birth to her son Galad Damodred, Tigraine likewise vanished, also on the advice of Gitara Moroso.
Mordrellen was taken ill shortly after Tigraine's disappearance. Heartbroken with grief, she quickly died. With no surviving heirs, the Third War of Andoran Succession took place and the Lion Throne passed to Morgase Trakand.
Mordrellen's daughter Tigraine traveled into the Aiel Waste. There, under the name 'Shaiel', she caught the eye of the clan chief of the Taardad Aiel, Janduin. Tigraine gave birth to his son on the slopes of Dragonmount during the Battle of the Shining Walls in late 978 NE. Thus, Mordrellen is the grandmother of the Dragon Reborn, Rand al'Thor.
After Mordrellen's death, House Mantear fell from grace and became only a middling house of not particularly great importance. In 999-1000 NE, during the Fourth Succession War, Lord Perival Mantear, the then-High Seat of the house, swore fealty to Elayne Trakand and supported her rise to the Lion Throne.
The spelling "Modrellein" was originally used for this character in The World of Robert Jordan's The Wheel of Time and in earlier editions of The Fires of Heaven and Lord of Chaos. However, Robert Jordan appears to have later retconned this name to 'Mordrellen', likely to avoid confusion with the earlier Queen Modrellein of Andor mentioned in The Dragon Reborn. This new spelling appears in Crossroads of Twilight and in some later editions of the earlier books.