There are 4 books in the Last King of Osten Ard series. The newest book is The Navigator's Children which came out in 2023.

1
The Witchwood Crown

Book cover of The Witchwood Crown

'Fawless epic fantasy . . . An instant fantasy classic' - Kirkus

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Thirty years ago Ineluki, the Storm King, was destroyed and his armies scattered. Osten Ard has been at peace ever since, ruled by Simon Snowlock, kitchen boy made king, and Miriamele, King Elias' only child. But now…

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2
Empire of Grass

Book cover of Empire of Grass
Set in Williams' New York Times bestselling fantasy world, the second book of The Last King of Osten Ard returns to the trials of King Simon and Queen Miriamele as threats to their kingdom loom...

The kingdoms of Osten Ard have been at peace for decades, but now, the threat…

3
Into the Narrowdark

Book cover of Into the Narrowdark

'A master storyteller' Brandon Sanderson

The New York Times bestselling world of Osten Ard returns in the third Last King of Osten Ard novel, as threats to the kingdom loom . . .

The High Throne of Erkynland is tottering, its royal family divided and diminished. Queen Miriamele has been…

4
The Navigator's Children

Book cover of The Navigator's Children
The latest saga in the New York Times bestselling world of Osten Ard concludes in the fourth and final Last King of Osten Ard novel.

The Hayholt is besieged by the Norns. Once the home of their immortal brethren, the Sithi, now capital of the kingdom of men, the fabled…