Petrus Ryff
Petrus Ryff ( ; ; 8 May 1552 – 19 May 1629 ) was a Swiss mathematician , physician and chronicler from Basel . 
<triplet> Petrus Ryff <subj> 8 May 1552 <obj> date of birth <subj> 19 May 1629 <obj> date of death <subj> Basel <obj> place of birth <triplet> Basel <subj> Swiss <obj> country