Collodd 144 o bobl eu bywydau yn nhrychineb 1966, 116 ohonyn nhw’n blant ysgol gynradd, pan lithrodd tomen lo i lawr ochr y mynydd uwchlaw pentref Aberfan, ger Merthyr Tudful.
The 1966 disaster claimed the lives of 144 people, 116 of them primary school children, when a spoil tip containing waste material from coal mining slid down from its position on the hillside above the village of Aberfan, near Merthyr Tydfil.