Both/
First of all all the Proverbs that are written by the wise king Solomon the son of king David is found in the old testament and not in the new testament The book of Proverbs is written by king Solomon. and follows the book of Psalms.
King Solomon died in 931 B.c.
You could say king Solomon.
This is not an Old Testament question
The Song of Solomon.
The old testament was written by many people like Solomon and David. The New testament was written mostly by Paul from Romans to Revelation except John 1,2, and 3. But all together God told them to so it was him.
Solomon does not summon any angels in his story of the Old Testament book of I Kings.
The Old Testament.
New Testament
The Old Testament records that Solomon had many gods in his house.
Yes it is one of the books in the old testament.
Solomon says he was dark or black.