PARIS (AP) — France and Britain may have a history as rivals, but that hasn't kept British citizens from rushing to become French before their native country leaves the European Union.

Catherine Norris Trent, who has lived in Paris since 2007, worried Brexit might force her to leave her French partner and their two young children.

Even though the EU has promised to let Britons living in member countries stay where they are after the U.K. pulls out, Norris Trent says only citizenship guaranteed the estimated 150,000 U.K. nationals in France the security to remain she craved.

She was part of a throng of people naturalized last week during a one-hour ceremony at Paris' monumental Pantheon, where French literary luminaries such as Victor Hugo and famous foreign-born French people such as Marie Curie are buried.