The birth of native Estonian literature was in 1810 to 1820 when the <answer>patriotic and philosophical</answer> poems by Kristjan Jaak Peterson were published. Peterson, who was the first student at the then German-language University of Dorpat to acknowledge his Estonian origin, is commonly regarded as a herald of Estonian national literature and considered the founder of modern Estonian poetry. His birthday on March 14 is celebrated in Estonia as the Mother Tongue Day. A fragment from Peterson's poem "Kuu" expresses the claim reestablishing the birthright of the Estonian language:
What subjects were Kristjan Jaak Peterson poems on?
patriotic and philosophical