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Einar Benediktsson's poetry was a significant contribution to the nationalistic revival which led to Iceland's independence. To this end, he was active both in founding the Landvarnarflokkurinn in 1902, and as the editor of Iceland's first daily newspaper, Dagskrá, from 1896 to 1898. As a poet, he may be classified as a Neo-Romantic. He advocated for Greenland to become part of an independent Iceland.
He pioneered as a strong advocate of inward foreign investment to utilize Iceland's natural resources. In 1906 he joined the management of two companies, Skjálfanda and Gigant, formed to build and operate hydroelectric power plants, particularly the northern waterfalls of the Skjálfandafljót and Jökulsá á Fjöllum rivers. Fund raising began, but there was opposition from people who objected to foreign involvement. In 1914 Einar Benediktsson was one of the founders of Fossafélagið Títan and three sister companies Sirius, Orion and Taurus, established to harness the power of the Þjórsá waterfalls.
His translations include English, and American poetry, and a masterpiece in rendering Henrik Ibsen's epic, Peer Gynt, into Icelandic. Einar Benediktsson was buried at Iceland's national shrine, Þingvellir. He has descendants living today in Iceland, other European countries, and the United States, most notably including former ambassador and namesake Einar Benediktsson (b. 1931).
- 1897: Sögur og kvæði (Stories and poems)
- 1901: Pétur Gautur, translation from Henrik Ibsen's Peer Gynt.
- 1906: Hafblik, poems
- 1913: Hrannir, poems
- 1921: Vogar, poems
- 1930: Hvammar, poems
- Páll Steingrímsson (27 January 1940). "Einar Benediktsson" (in Icelandic). Vísir.
- Lögfræðingatal 1736-1992. Reykjavík: Iðunn. 1993.
- "Íslendingar gerðu tilkall til Grænlands fyrir sjálfstæði". www.frettabladid.is. Retrieved 2019-08-23.
- HNIT (April 2003), Urriðafossvirkjun í Þjórsá allt að 150 MW og breyting á Búrfellslínu 2 (PDF) (Environmental Impact Assessment Report) (in Icelandic), Landsvirkjun, retrieved 2017-05-21
- Íslenska Alfræðiorðabókin A-G. 1990. Editors: Dóra Hafsteinsdóttir and Sigríður Harðardóttir. Örn og Örlygur hf., Reykjavík.