Lothiriel, daughter of Prince Imrahil of Dol Amroth, was 22 when she married Eomer in 3021 the last year of the Third Age. She became Queen of Rohan, and they had one son, Elfwine the Fair who ruled Rohan after Eomer's death. This information is found in Appendix A of Lord of the Rings.
For more information on the Queen of Rohan, please look to the links below.
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This website is a member of The Eorlingas Network, a site devoted to all things Rohirrim.