Final answer:
Feudal kings in the Middle Ages enforced the feudal system, collected taxes, built castles, maintained legal systems, and led their royal armies into battle; they relied on a network of loyalties within a hierarchical society, and the church held a significant role in governance.
Step-by-step explanation:
The sentence to be completed seems to be a description of the roles and responsibilities of feudal kings during the Middle Ages. With this context, the correct completion of the sentence would be: "Feudal kings enforced the feudal system and collected taxes.
They built castles and made sure legal systems were maintained. Kings also led their royal army into battle." The feudal system relied on a network of loyalties typically anchored by the exchange of protection for service between lords and their vassals. In this structure, bishops and abbots sometimes held land and status as lords, and the church played a significant role in the governance due to its vast landholdings and influence.