How do I prove that I am not married?

Hello everyone! As the title suggests I want to know how i can prove that i am not married. I am currently a student in Latvia, Europe. I have a situation where I need to prove that I am not married previously. Of course i have my passport and my DL where it states only my father’s name but I would like to know if there is any other documents I can use to show that i have never married.

Or maybe if we have any sites where we can access information or personal data about ourselves? Just want to know the best way I can do this as for the process they don’t specify what kind of documents they need. They just mention that to provide proof that you’re not previously married.

Please help!! Any advice would be greatly appreciated Thank you