Question: Why is a man allowed to have more than one wife in Islam? i.e. why is polygamy allowed in Islam?

1. Definition of Polygamy
Polygamy means a system of marriage whereby one person has more than one spouse. Polygamy can be of two types. One is polygyny where a man marries more than one woman, and the other is polyandry, where a woman marries more than one man. In Islam, limited polygyny is permitted; whereas polyandry is completely prohibited.

Now coming to the original question, why is a man allowed to have more than one wife?

2. The Qur’an is the only religious scripture in the world that says,”marry only one”.

The Qur’an is the only religious book, on the face of this earth, that contains the phrase `marry only one. There is no other religious book that instructs men to have only one wife. In none of the other religious scriptures, whether it be the Vedas, the
Ramayan, the Mahabharat, the Geeta, the Talmud, or the Bible does one find a restriction on the number of wives. According to these scriptures, one can marry as many as one wishes. It was only later,
that the Hindu priests and the Christian Church restricted the number of wives to one.

Many Hindu religious personalities, according to their scriptures, had multiple wives. King Dashrat, the father of Rama, had more than one wife. Krishna had several wives.