Desperate to reread

This story is quite well known but I forgot the title. The mc is a woman named Adna or something. She used to live as a Prince, but during the war (?) the Queen made her run away n want her to live as her real self. The Queen died in fire along with the servants. The mc run and become a maid. She was sent to married with the ml to replace the noble's daughter. Mc good in sword fighting n mc n ml hv a son in the ending. If I'm not mistaken, their son will become a king and have his own story. Thks in advanced ヾ(❀╹◡╹)ﾉ~