Jupiter was a god for the Romans. 

Jupiter was a king of the gods. 


Jupiter was the king of the gods in ancient Rome. 

An eagle was his sacred animal. The Roman army often used the eagle as a symbol.
Special priests served him. One high priest was called the Flamen Dialis. He had many strict rules to follow. For example, he could not touch anything related to death. He also could not ride a horse. 
In ancient Rome, Jupiter was the most important god. 

Jupiter had several special symbols that represented his power. His main tool was the thunderbolt. 
History shows that Jupiter had roots in older traditions. Some thinkers believe his name comes from words meaning "sky father." 
Many different groups of people served Jupiter in Rome. The high priest of Jupiter was called the Flamen Dialis. 
Jupiter's role was tied to how Rome was governed. The Romans believed he gave them power because they honored him so much. 
Jupiter was the supreme deity in the ancient Roman religion. 

Jupiter possessed specific symbols that represented his divine authority. His primary implement was the thunderbolt. 
As the god of the sky, Jupiter functioned as a divine witness to oaths. Romans believed that justice and good government depended on this sacred trust. He was the central guardian of the state within the Capitoline Triad. This group included Jupiter, Juno, and Minerva, located on the Capitoline Hill. Jupiter personified the divine authority of Rome's highest offices and its external relations. The Romans believed they held supremacy because they honored him more than any other people. 
Specific rituals were used to honor Jupiter and secure his support. During the annual feriae of the Capitol in September, consuls honored him. They would sacrifice a white ox with gilded horns to show gratitude. Triumphal generals also made offerings at the feet of his statue. Some scholars suggest the general in a triumph might have impersonated Jupiter. This is evidenced by the fact that they used his specific insignia. These included the sceptre and the toga palmata. 
The religious service of Jupiter involved specialized groups of priests. The Flamen Dialis was the highest-ranking member of the flamines. This was a college of fifteen priests dedicated to specific deities. The Flamen Dialis lived under many strict ritual prohibitions to maintain purity. He could not ride a horse or see the army outside the city boundaries. He was also forbidden from contacting anything related to death, such as corpses or funerals.
His wife, the Flaminica Dialis, also held important religious duties. She presided over the sacrifice of a ram on the nundinae, which were market days. The couple had to marry through a specific ritual called confarreatio. This ritual involved the sacrifice of spelt bread to Jupiter Farreus. Other officials, known as augurs, were responsible for interpreting Jupiter's will. They performed ceremonies called auguria to guide the state. 
Jupiter also played a role in international law and diplomacy. The fetials were a college of twenty men who managed religious affairs regarding foreign states. They applied the fetial law to ensure the gods protected Rome's international relations. In these rites, they invoked Jupiter as a witness to any treaty violations. If war was declared, the fetial would call upon Jupiter to witness the process. This occurred within a 33-day period. Jupiter acted as the divine defender of good faith in these complex legal procedures.
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