Century of Λ

The cosmological constant was proposed 100 years ago in order to make the model of static Universe, imagined then by most scientists, possible. Today it is the main candidate for the physical essence causing the observed accelerated expansion of our Universe. But, as well as a hundred years ago, its nature is unknown. This paper is devoted to the story of invention of Λ by Albert Einstein in 1917, rejection of it by him in 1931 and returning of it into the great science by other scientists during the century. The aim is to once again emphasize prominent role of cosmological constant in the development of ideas of modern physics and cosmology, focusing on the main points and publications, the choice of which may have a certain part of subjectivity.