Sosa's method was popularized on a large scale by Stephan Kekulé von Stradonitz in his Ahnentafel-atlas in 1898 and became known as Ahnentafel or the Sosa–Stradonitz Method.
Michaël Eytzinger (Freiherr Michael von Aitzing, Aitzinger, Eyzinger, or Eitzing) (born ca. 1530 in Obereitzing - died 1598 in Bonn), was an Austrian nobleman, diplomat, historian, and publicist, who wrote and published several works, including a renowned volume that states the principles of a genealogical numbering system, called an Ahnentafel, that is still in use today.
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Eytzinger’s method was used by Jerónimo de Sosa, in his work Noticia de la gran casa de los marqueses de Villafranca in 1676, and was popularized by Stephan Kekulé von Stradonitz in his Ahnentafel-atlas in 1898.