Münster: It's relationship to Anabaptism.

[Neto]

Which Old Testament law forbade polygamy?

Abraham had 3 wives
Jacob had 2 wives and 2 concubines
Soloman had 700 wives and 300 concubines (sex slaves from conquered lands)
David had 7 wives that are named and possible more unnamed wives and concubines. According to 2 Samuel 12 it was God who gave him his wives.
etc...

1: in the beginning as Jesus refers to

Mat 19:4  And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
Mat 19:5  And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
Mat 19:6  Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.

Secondly: as the law was wrote

Deu 17:15  Thou shalt in any wise set him king over thee, whom the LORD thy God shall choose: one from among thy brethren shalt thou set king over thee: thou mayest not set a stranger over thee, which is not thy brother.
Deu 17:16  But he shall not multiply horses to himself, nor cause the people to return to Egypt, to the end that he should multiply horses: forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.
Deu 17:17  Neither shall he multiply wives to himself, that his heart turn not away: neither shall he greatly multiply to himself silver and gold.

Solomon Is really a prime example of why God said this.

I would agree that the creation story, and others as well throughout the OT demonstrate that God's intention was that a man be married to only one woman, as long as she lives. But I agree with Ken's comment to the effect that God does say that He had blessed David with many wives. (Perhaps 'multiply' didn't include 'times two', or even 'times 6', or how ever many wives king David had. Solomon? That was multiplying.)
It was also God's clear intention that human kind not kill one another, and yet God helped king David (and many others) in doing just that, when it was also His purpose to bring about justice against evil men.

[Ken]

Which Old Testament law forbade polygamy?

Abraham had 3 wives
Jacob had 2 wives and 2 concubines
Soloman had 700 wives and 300 concubines (sex slaves from conquered lands)
David had 7 wives that are named and possible more unnamed wives and concubines. According to 2 Samuel 12 it was God who gave him his wives.
etc...

1: in the beginning as Jesus refers to

Mat 19:4  And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
Mat 19:5  And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
Mat 19:6  Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.

Secondly: as the law was wrote

Deu 17:15  Thou shalt in any wise set him king over thee, whom the LORD thy God shall choose: one from among thy brethren shalt thou set king over thee: thou mayest not set a stranger over thee, which is not thy brother.
Deu 17:16  But he shall not multiply horses to himself, nor cause the people to return to Egypt, to the end that he should multiply horses: forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.
Deu 17:17  Neither shall he multiply wives to himself, that his heart turn not away: neither shall he greatly multiply to himself silver and gold.

Solomon Is really a prime example of why God said this.

I would agree that the creation story, and others as well throughout the OT demonstrate that God's intention was that a man be married to only one woman, as long as she lives. But I agree with Ken's comment to the effect that God does say that He had blessed David with many wives. (Perhaps 'multiply' didn't include 'times two', or even 'times 6', or how ever many wives king David had. Solomon? That was multiplying.)
It was also God's clear intention that human kind not kill one another, and yet God helped king David (and many others) in doing just that, when it was also His purpose to bring about justice against evil men.

The point is that it is pretty easy to find the answer you are seeking in the Bible and justification for your actions if you choose to use blinders. Whether you are a Munsterite, a Southern slaveholder, a soldier massacring Indian villages on the Great Plains, or Tomás de Torquemada leading the Spanish Inquisition.