Showing The Philosopher Kings by Jo Walton

Twenty years have passed since the goddess Athene founded the Just City. The god Apollo is still living there, albeit in human form. Now married and the father of several children, the man/god struggles to cope when tragedy befalls his family. On the surface he handles his feelings in his stride; but it's evident that deep down he is unhinged with raw, human grief. Fuelled by a bloodthirsty desire for revenge, Pythias sets sail for the mysterious Eastern Mediterranean to find the man he believes may have caused him such great pain. What his expedition actually discovers, however, will change everything.