Historically? All of this is at least disputed. Within the church canon? “[Jesus] broke the bread, gave it to his disciples and said ‘Take this, all of you and eat it, for it is my body, which will be given up for you.’ When [the last] supper had ended he took the cup. Again he gave thanks and praise, gave the cup to his disciples and said 'Take this, all of you, and drink from it. For it is my blood, the blood of the new covenant which will be shed for you and for all so that sin may be forgiven.”
Theologically speaking it’s not a matter of debate at all that communion predates Christ’s death and therefore the founding of the Church or the establishment of the Lord’s prayer.