The Irish bardic system, along with the Gaelic culture and learned classes, were upset by the plantations, and went into decline. Among the last of the true bardic poets were Brian Mac Giolla Phádraig (c. 1580–1652) and Dáibhí Ó Bruadair (1625–1698). The Irish poets of the late 17th and 18th centuries moved toward more modern dialects. Among the most prominent of this period were Séamas Dall Mac Cuarta, Peadar Ó Doirnín, Art Mac Cumhaigh, Cathal Buí Mac Giolla Ghunna, and Seán Clárach Mac Domhnaill. Irish Catholics continued to receive an education in secret "hedgeschools", in spite of the Penal laws. A knowledge of Latin was common among the poor Irish mountaineers in the 17th century, who spoke it on special occasions, while cattle were bought and sold in Greek in the mountain market-places of Kerry.