أول_خلفاء

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: أول_خلفاء

Indicates that an entity is the first caliph (initial successor in leadership) in relation to another entity or context.