Birthday of our national poet

J.L. Runeberg (1804-1877) was a lyric and epic poet and he wrote also our national anthem. He is considered our national poet and celebrated by a special sweet cake flavoured with arrack punch, maybe his favourite liquor. His wife was also a published writer. They had seven (7) sons and he had several mistresses, of course.
I am reading a new biography that has just recently come out.