Nineteenth-century Estonian poet and playwright who was nicknamed "Koidulaulik" ("Singer of the Dawn"). Her notable literary works include Emajoe Oobik, Vainulilled, and Saaremaa Onupoeg.
She attended grammar school in Parnu, Estonia. In her adult years, she lived near St. Petersburg, Russia.
Her best-known poem, "Emajõe Ööbik" ("The Nightingale of the Mother River"), was published in 1867.
Her father, Johann Voldemar Jannsen, established an Estonian newspaper in Parnu. She married a Latvian military doctor and gave birth to three children.
She was born in the same country as fellow poet Mats Traat.