Yahweh is the name of the state god of the ancient Kingdom of Israel and, later, the Kingdom of Judah. His name is composed of four Hebrew consonants (YHWH, known as the Tetragrammaton) which the prophet Moses is said to have revealed to his people and is sometimes given in English as "Jehovah."
More about: YahwehDefinition
Timeline
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c. 3500 BCE - c. 1200 BCEYahweh possibly develops from Canaanite god of metallurgy during the Bronze Age.
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c. 1080 BCE - c. 722 BCEYahweh develops as state god of the Kingdom of Israel and the later Kingdom of Judah.
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c. 515 BCE - 70 CEThe Second Temple Period; Judaism is revised, scriptures canonized, Yahweh becomes sole deity, monotheism established.