(A demonstrator waves a flag on the Champ de Mars near the Eiffel Tower in Paris, to protest France’s planned legalisation of same-sex marriage, January 13, 2013. REUTERS/Charles Platiau)

Marchers filed through the French capital on Sunday to protest against President Francois Hollande’s plan to legalize gay marriage and adoption.

Here is a timeline on marriage and the rights of homosexuals in France.

1791 – Following the French Revolution, the penal code is amended to decriminalize homosexual acts. But social disapproval in the traditionally Catholic country remains strong until recent years.

1995 – Saint Nazaire becomes the first city to allow homosexuals to register as concubines, a legal concept allowing limited shared rights for unmarried couples living together.

1999 – The National Assembly approves “civil solidarity pacts” (PACS) after heated debates but few protests. Open to all, they provide many tax breaks granted to married couples in joint tax returns. The PACS is a contract certified by a court clerk, without a civil wedding ceremony, and can be terminated in writing to the court. Partners retain their assets separately and there is no duty to provide for a former partner.