What case established a right to privacy in marital relations?

The case that established a right to privacy in marital relations is Griswold v. Connecticut. In this landmark decision, the Supreme Court ruled that the Constitution implicitly guarantees citizens' right to privacy, particularly in matters of marriage and contraception. The case involved a Connecticut law that prohibited the use of contraceptives, even by married couples. The Court found that this law violated the right to marital privacy, which is derived from various amendments in the Bill of Rights, including the First, Third, Fourth, and Ninth Amendments. This ruling set a significant precedent for later cases regarding privacy and reproductive rights, illustrating the importance of individual rights in personal and intimate matters.