peakTerritorialExtentUnder

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: peakTerritorialExtentUnder

Indicates that one entity reached its greatest territorial size or coverage while under the control, rule, or influence of another entity.