Sir Caerffili yw Senghennydd . Mae'n adnabyddus fel lleoliad Tanchwa Senghennydd a laddodd 439 o lowyr ar 14 Hydref 1913 . English: Senghenydd is a town in the Aber Valley, roughly four miles north-west of the town of Caerphilly and is within the county borough of Caerphilly , Wales . It