Holmium is discovered spectroscopically in 1878 by…
1878 CE
Holmium is discovered spectroscopically in 1878 by Swiss chemists Jacques-Louis Soret and Marc Delafontaine, and independently in 1879 by Swedish chemist Per Teodor Cleve, who separate it chemically from erbium and thulium.
Cleve names the element after Holmia, the Latinized form of Stockholm, his native city.