Thucydides (Athens, 5th century BC) first mentioned immunity to an infection that he called "plague" http://is.gd/1qgAQ
Bust of Thucydides residing in the Royal Ontario Museum, Toronto. Image source: Wikipedia, public domain.
Who was the boy who received the first vaccine by Edward Jenner in 1796? James Phipps http://is.gd/1qgRs
1802 caricature of Jenner vaccinating patients who feared it would make them sprout cowlike appendages. Image source: Wikipedia, public domain.
When does adaptive immunity (antibodies, T and B lymphocytes) appear in evolution? Vertebrates. http://is.gd/1qhK9
What species has the most immunoglobulin types? Homo sapiens (human) has 9 immunoglobulin types: IgG (1-4), IgA (1-2), IgM, IgE, IgD (GAMED)
What is the first immunoglobulin to appear in evolution? IgM, in jawed vertebrates. http://is.gd/1qhK9
Discoverer of phagocytosis, Mechnikov, made 2 unsuccessful suicide attempts (1875, 1880), then won the Nobel prize in 1908 http://is.gd/1qiLo
Ilya Ilyich Mechnikov, Nobel Prize in Medicine (1908). Image source: Wikipedia, public domain.