Perspectiva Literaria is a book by Johannes Lencker in the 1500s. I am a descendant (and relative) of many Johannes Lenkers, who came from Switzerland. The family proved to be abolitionist in Pennsylvania.

Here are direct and nearly direct ancestors:

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Johannes Lenker
1710-Unknown

Johann Michael Lenker
1730-1797

Johann Philip Lenker
1759-1824

John Jacob Lenker
1760-1832

John Michael Lenker
1773-Unknown

Johann Adam Lenker
1807-1857

Jonas Jonathan Lenker
1812-Unknown

John Lenker
1816-1887

Johann Philip Lenker
1802-1885

Jonathan Lenker
1836-1886

Clayton Jonathan Lenker
1869-1944

...

Jonathan Paul Cooper
(1989-Present.)