Urbánszki László - Vérszerződés - A Honfoglalás-sorozat 1. kötete

In the middle of the 1800s, the Hungarian tribes lived under constant threat by the Dnieper, in Etelköz. From the north, the strengthening city-state of Kiev would expand, from the east the declining but still very strong Khazarian Empire, from the south the Peshenians, from the northeast the Kimek nomads would squeeze them, and the Hungarian tribes would also distort each other.
Russian (long ago) sailors attack a small Hungarian accommodation, taking its inhabitants captive. Álmos, the prince of the county, personally leads the pursuers, and then they take cruel revenge. The land-hungry Russian lords, using the events as an excuse, raid the nearby Kürt and Gyarmat tribes. Victory after victory is piled up, and it can be expected that the Hungarian tribes unable to unite will be liquidated one by one.
Álmos realizes the imperative need and begins to organize an alliance...
The Blood Treaty is the opening volume of the four-part Conquest series. The writer approaches the sensitive topic in a new way. He does not believe in self-serving heroism, his fallible figures are not guided by divine forces, but by compelling events. Sleepily, he negotiates, prevails, sometimes uses force to carry out his will, finally wins, and the Blood Pact is concluded. If he is not there, Hungarians will crumble, like the Peshenians and Kunos who are unable to unite permanently. Through him, the "Hetumoger" alliance becomes one of the defining great powers of the region, and sets off on the path at the end of which they will find a new, great homeland in the Carpathian Basin.