Answer:
Cyrus the Great
• created the Persian Empire
• expanded the Persian Empire's borders
• created the Immortals to protect the empire
• showed tolerance for other religions and customs
Darius the Great
• created 20 provinces led by satraps
• built major roads for communication and trade
• showed tolerance for other religions and customs
• created a coinage system
Based on these leaders achievements, they could have also been called the tolerant or the fair. These names would be fitting because the two kings were known for being fair to their subjects and tolerant toward the religions and customs of the lands that they conquered.