Iestyn Tyne was brought up on a farm in Boduan, Pen Llŷn and following his school education, he studied for a degree in Welsh at Aberystwyth University, graduating in 2018. He has now settled in Waunfawr with his family. Currently serving as Future Wales Fellow (2023-25) and Town Poet of Caernarfon, Tyne is a multitalented poet, writer, musician, editor, and translator.

He is the co-founder and co-editor of Y Stamp magazine and publications, and has published three volumes of poetry to date. He is a member of a number of musical groups and has performed his work across Wales and beyond, including tours in Europe, South America and Africa, He won the Crown at the Urdd National Eisteddfod yn 2016, and the Chair in 2019, becoming the first person in the history of the event to have won both main literary prizes. In 2019, he was appointed the National Eisteddfod's first ever poet in residence, undertaking the work of responding to the community campaign leading up to the Llŷn ac Eifionydd Eisteddfod of 2023. He is co-editor of Welsh (Plural), a collection of essays on the future of Wales, published in March 2022.

With Leo Drayton, he was the author of Robyn (Y Lolfa, 2021) in the Y Pump series of novels for young adults. Five, an English adaptation of the collection by Mared Roberts was published by Firefly Press in 2025.

His third poetry collection, Dysgu Nofio, was selected to our 2023 Bookshelf and in his latest publication, a creative non-fiction book Y Cyfan A Fu Rhyngom Ni (Gwasg y Bwthyn, 2025) he blends memoir, literary criticism, cultural history, and creative writing exploring the life and work of poet Prosser Rhys and the period leading up to his win the National Eisteddfod Crown in 1924 with his controversial poem "Atgof ("Memory").

Cyhoeddiadau'r Stamp's first volume of poetry in translation was published in translation at the end of 2024. Nodiadlyfr bach y wawr, is a collection of fifteen poems by Najwan Darwish, one of Palestine's most prominent contemporary poetic voices, selected and translated from Arabic into Welsh by Iestyn Tyne and Hammad Rind.