Sebastian Fabian Klonowic | |
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 | |
| Born | 1545 Sulmierzyce, Poland |
| Died | 29 August 1602 Lublin, Poland |
| Pen name | Acernus |
| Occupation | poet, composer |
| Language | Polish, Latin |
| Nationality | Polish |
Sebastian Fabian Klonowic (1545 Sulmierzyce – 29 August 1602 Lublin) was a Polish poet, composer and mayor of Lublin.