The Answer Is:

Philippians 2:9 - 11

Jesus is Lord.
The question for each of us is one of allegiance!

Who Is He?
Lord, is the name above all names.

Yet, it is a position role with little meaning today.

The English term Lord, is the German title Marquis, the Lord of the March.
I have held this Germanic title since 1967 - though at the time it made no sense to me.
I, in theory, control a district of Switzerland and would supply the German Kaiser with refuge and supplies in time of war.
Of course the Canton of Bern seized the estate in the mid-19th century.
My grandmother, the Marquess, died in 1984 without ever telling me family history or peerage!
Like all things in my life the appearance of, but not in reality ...

Why Killed?
Christians called Jesus Lord, Caesars (Nero's) title.
Nero was not humored.

Why Does It Matter Today?
When the New Testament was written down, Jesus was described with a title meaningless to us today!
He is Lord - your Lord - whether you care or not.
Your allegiance is expected - if you claim to be His.
We must live as though He really is our Lord.

Consider Romans 10:9

He is already the Lord of all!

Who Did This?
God.
He did it all:
Jesus brought down
Jesus lifted up.
Jesus exalted!

Everyone will worship Him in submission.
All creation
Living and dead
Even Satan!
(us in our embarrassment!)