Radiocarbon dating has been performed on cortical femoral tissue samples from Tycho Brahe (1546-1601) and his wife Kirsten Barbara Jorgensdatter (1549-1604). No discernible reservoir effect has been observed in either skeleton.
This combined with unusually high delta N-15 values and seemingly terrestrial delta C-13 values, makes us suggest that a large fraction of their protein intake came from freshwater fish raised in stagnant pools.