The first issue of An Claidheamh Soluis, an Irish nationalist weekly broadsheet newspaper is published by Conradh na Gaeilge (the Gaelic League) on March 17, 1899. It is named for the “Sword of Light” (in modern spelling Claíomh Solais) of Gaelic myth.

Eoin MacNeill is the first editor of the newspaper, overseeing its publication from 1899 to 1901. In 1900, Conradh na Gaeilge takes control of the weekly bilingual paper Fáinne an Lae, when its editor goes bankrupt. Fáinne an Lae is merged with An Claidheamh Soluis under the title An Claidheamh Soluis agus Fáinne an Lae.

From 1903 to 1909 the paper is edited by Patrick Pearse, the teacher and barrister who later becomes a key figure in the Easter Rising in 1916. Under his editorship, the paper plays a prominent role in the Irish Literary Revival, publishing original literary works in both Irish and English and devoting considerable space to commentary on cultural matters. From 1909 to 1916 the editor is Seán Mac Giollarnáth.

The paper continued under the names Fáinne an Lae (1918–19, 1922–30) and Misneach (1919–22), reverting briefly to An Claidheamh Soluis in 1930–31. It ceases publication in 1931.