capitalCityAtPeak

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: capitalCityAtPeak

Indicates that a city served as the capital of an entity (such as a country or region) during the entity’s period of greatest power, influence, or territorial extent.