According to Jewish chronology, it was made in 1312 BCE.
The covenant with Moses is already made and most religions hold that you cannot intercede with the Dead for a new covenant.
Moses
The three major Jewish covenants are Noah's Covenant, Abraham's Covenant, the Mosaic Covenant (Moses' Covenant.)
Moses
It must be Moses and his brother Aaron.
In the Sinai Covenant, God made a covenant with the Israelites through Moses on Mount Sinai. The covenant included the giving of the Ten Commandments and other laws which the Israelites were to follow. It established rules for the Israelites to live by, and outlined the consequences for obedience and disobedience.
The Ark of the Covenant is said to have carried the tablets of the Ten Commandments given to Moses by God, as well as Aaron's rod and a pot of manna.
Moses
On Mount Sinai in Egypt, God created a covenant with the people of Israel by speaking to Moses, their leader. This occurred in Genesis chapter 34:10-28.
The b'rit (covenant) (Exodus 34:10, and many other verses).
The covenant between God and the Israelites, with Moses serving as messenger, was made on the 5th of Sivan (late spring/early summer), 1312 BCE. Non-traditional opinions may place it at an earlier date.See also:More about the Israelite covenant
It was the Arc Of The covenant.