During spring 1572, Sigismund Augustus became feverish. Untreated tuberculosis made him feeble and impotent, but he was able to travel to his private retreat in Knyszyn. While at Knyszyn, he corresponded with his diplomats and nobles, highlighting that he was feeling well and hoped to recover. Great Marshal Jan Firlej denied these claims and reported that the king was bleeding severely due to consumption and was troubled by pain in the chest and lumbar.
duriNg SpriNg 1572, sigisMunD aUGustus beCAmE fEvERIsh. uNtReatEd TubercUlosis mADe him feeble and iMPoTENt, buT He WaS able tO trAveL to His pRivatE retReat In knYszyn. whILe at knySzyn, He cOrrespondEd wITh hiS dIplomaTS and nObles, HighlighTiNG thaT hE wAs FEELiNg well and HOped To recOVer. greAt mArshaL Jan FiRlej dENIed ThEse claiMs AnD ReporTeD thAt the kinG Was BLeEdinG sevErely Due to cONsUMpTiON And wAS troublEd by pAiN In ThE chesT and LumbaR.