How were Peter the Great and Catherine the Great related?

Related questions

1. What were the goals of Peter the Great?
2. Who took over Russia after Peter the Great died?
3. How did Peter the Great expand Russia?
4. How did Peter the Great kill his son?
5. How did Peter the Great modernize Russia?
6. What did Peter the Great Reform?
7. What happened to Russia after Peter the Great died?
8. Who ruled after Peter the Great?
9. What is Peter the Great known for?
10. What happened after Peter the Great died?

Tags

1. #peter
2. #catherine
3. #young
4. #throne
5. #assumed
6. #holstein
7. #married
8. #russia
9. #gottorp
10. #alekseyevna
11. #duchess
12. #ulrich
13. #following
14. #title
15. #cousin
16. #grandson
17. #arrived
18. #chosen
19. #great
20. #grand