Polygamy, or the practice of having multiple spouses, has been a topic of debate among moral thinkers throughout history. Different philosophers, religious leaders, and ethicists have held diverse perspectives on the issue. Here are some examples:

1. Plato: In his work “The Republic,” Plato argued that polygamy is acceptable if it is based on a rational and just arrangement, where the partners are equal and there is no exploitation.
2. Aristotle: Aristotle believed that polygamy is natural and beneficial, as it allows for the propagation of the species and the formation of strong family bonds.
3. St. Augustine: The Christian theologian St. Augustine (354-430 CE) condemned polygamy as a sin, citing the biblical prohibition on marrying multiple spouses (Exodus 20:17). He argued that monogamy is the only acceptable form of marriage.
4. John Calvin: The Protestant reformer John Calvin (1509-1564) believed that polygamy was permissible under certain circumstances, such as when a man’s first wife is barren or dies without children.
5. Thomas More: The Catholic philosopher and politician Thomas More (1478-1535) argued that polygamy is not inherently immoral, but it should be subject to just and equitable arrangements.
6. John Stuart Mill: The English philosopher John Stuart Mill (1806-1873) believed that polygamy should be legalized, arguing that individuals should have the freedom to choose their own lifestyle and relationships.
7. Friedrich Nietzsche: The German philosopher Friedrich Nietzsche (1844-1900) saw polygamy as a means to overcome traditional societal norms and to create a new, more liberated morality.