Einstein and Eddington and the eclipse in Principe: Celebration and science 100 years after

On May 29, 1919, at Ro\c{c}a Sundy, Principe island, Eddington confirms Einstein's general relativity theory for the first time by photographing stars behind the obscured Sun during a total eclipse. History was made. At Sobral, Eddington's astronomer colleagues photograph the same eclipse and also conclude that light from distant stars suffers a deflection when passing by the gravitational field of the Sun, in accordance with general relativity. With the confirmation of general relativity, a theory of gravitation at a fundamental level, physics became, once and for all, relativist and its future was outlined. The first world war had finished a few months before and the deep wounds between nations were yet to heal. Science wanted to be above it all showing that people could be united by a common goal. This year, the 100 years of this achievement was commemorated with the scientific conference "From Einstein and Eddington to LIGO: 100 years of gravitational light deflection" in Principe to celebrate this landmark event. We report here on this conference of celebration.