Which poet's works frequently incorporated elements of Irish folklore?

William Butler Yeats is renowned for integrating elements of Irish folklore into his poetry. His deep connection to Irish culture and heritage is evident throughout his body of work. Yeats drew inspiration from traditional Irish myths, legends, and folklore, often employing symbols and motifs that reflect the richness of the Irish landscape and its history.

His interest in the mystical and the supernatural, along with his involvement in the Irish literary revival, led to a unique blend of the personal and the folkloric in his poetry. This not only highlights the cultural narratives of Ireland but also elevates them to universal themes that resonate with a broader audience. The other poets listed, while talented in their own right, did not focus on Irish folklore in the same way that Yeats did, making him the standout choice for this particular question.