High Quality Content by WIKIPEDIA articles! Lydia Emilie Florentine Jannsen, (24 December 1843 – 11 August 1886), known after her pen name Lydia Koidula was an Estonian poet. Her sobriquet means ‘Lydia of the Dawn’ in Estonian. It was given her by the writer Carl Robert Jakobson. She is also frequently referred to as Koidulaulik – ‘Singer of the Dawn‘.