Dr. Rebecca Thomas is a Cardiff-based author and Senior Lecturer in Medieval History at Cardiff University. She has published three novels for children and young adults: Dan Gysgod y Frenhines (Under the Queen's Shadow, Gwasg Carreg Gwalch, 2022), Y Castell ar y Dŵr (The Castle on the Water, Gwasg Carreg Gwalch, 2023), and Anturiaethau'r Brenin Arthur (The Adventures of King Arthur, Gwasg Carreg Gwalch, 2024).  Her debut novel for adults Y Tŵr (The Tower, Sebra, 2025) was followed by Ynys Gwales (Gwales Island, Sebra, 2026) which won the Daniel Owen Memorial Prize at the 2026 National Eisteddfod.

Her essays have been published in O'r Pedwar Gwynt and Folding Rock - https://foldingrock.com/writing-welsh-witches/