Through his invented Palaiologos descent, Sarsfield in 1830 attempted to push his claim on the throne of the recently established Kingdom of Greece.
Though he wrote to prominent nobles in the United Kingdom, including King William IV, and might have contacted other monarchs, he did not manage to rally any support.
[1] On 18 May 1823, Sarsfield wrote to the British Home Office to request the return of "certain titles and dominions in Ireland" to him by the right of his lineage.
In 1830,[2][3] while living on Duke Street in Wexford, Sarsfield petitioned Lords Aberdeen and Palmerston to press his "ancestral" claim to the recently established Kingdom of Greece, which had been offered to the young prince Leopold of Saxe-Coburg and Gotha.
In his letter, Sarsfield referred to himself as "the Comte de Sarsfield of the Order of Lidelity, Heir and Representative to his Royal Ancestors Constantines the last Reigning Emperors of Greece subdued in Constantinople by the Turks" and he included a large genealogical tree which traced his descent both from the Palaiologos dynasty (the last reigning dynasty of the Byzantine Empire) and from the medieval Irish king Diarmaid mac Murchadha.