[2] During his summer holidays in his younger years, he spent time in Ireland (near Kenmare, County Kerry) with his paternal uncle, Father James Beazley, where he began to learn Irish.

[4] After finishing his education at St Xavier's, Béaslaí was encouraged to begin Irish poetry by Tadhg Ó Donnchadha.

He was offered a permanent position with Independent Newspapers, as assistant leader writer and special reporter for the Dublin Evening Telegraph.

[4] After his early introduction to Irish poetry he became involved in staging Irish-language amateur drama at the Oireachtas annual music festival.

Between 1913 and 1939 he wrote many plays, including Cliuche Cartaí (1920), An Sgaothaire agus Cúig Drámaí Eile (1929), An Danar (1929) and An Bhean Chródha (1931).

He wrote about these topics in newspapers such as the Standard and The Kerryman; his most notable work in newspapers during his later life included his contribution to the Irish Independent, which published a section called ‘A Veteran Remembers’ five days a week from 16 May to June 1957, as well as a weekly section called ‘Moods and Memories’ on Wednesdays from 24 May 1961 to 16 June 1965.

While in Dublin, he joined the Keating Branch of the Gaelic League, and after he moved to Ireland he began using the Irish form of his name, Piaras Béaslaí, rather than Percy Beazley.

[3] A founding member of The Irish Volunteers in 1913, in January 1916 he served as a courier for political activist and revolutionary leader Seán Mac Diarmada.

In an audio recording to which he contributed in 1958, he detailed his experience in the Rising, describing the rebels assembling before noon in Blackhall Street at battalion headquarters.

Then, at the 1921 general election, he was returned unopposed to the Second Dáil as a Sinn Féin Teachta Dála (TD) for Kerry–Limerick West.

[12] Béaslaí was also instrumental in establishing An Fáinne, an Irish-speaking league whose members vowed to speak solely Irish among themselves and wore a membership badge of a circle.