The Hippopotamus Marsh

Volume One of the Lords of the Two Lands series.
 
After a gradual and mostly bloodless invasion, Egypt has fallen into the hands of a foreign power known as the “Rulers of the Upland.” Using subtle means of political power and economic country, plundering its riches and slowly subverting its religion and culture.
But there is one family in Thebes, claiming descent from the last true King of Egypt, that cannot accept the rule of the foreign king Apepa. Defying him becomes the only clear option for the persecuted yet proud Seqenenra Tao, Prince of Weset, whose shocking revolt sets in motion a series of events that will either destroy his family or resurrect a dynasty and an entire way of life for Egypt.