30

Announcement of the discovery of penicillin by Ayrshire-born Sir Alexander Fleming.
Announcement of the discovery of penicillin by Ayrshire-born Sir Alexander Fleming. …

Arthur Griffith forms Cumann na nGaedheal, which later becomes Sinn Féin
Arthur Griffith forms Cumann na nGaedheal, which later becomes Sinn Féin …

Sir Charles Stanford, composer, is born in Dublin
Sir Charles Stanford, composer, is born in Dublin …

Birth in Orkney of John Rae, explorer and surveyor of Canadas northern coastline.
Birth in Orkney of John Rae, explorer and surveyor of Canadas northern coastline. …

The first recorded meeting of the Presbyterian general synod of Ulster is held at Antrim
The first recorded meeting of the Presbyterian general synod of Ulster is held at Antrim …

The English poet Edmund Spenser is appointed Sheriff of Cork
The English poet Edmund Spenser is appointed Sheriff of Cork …

A great council meets at Dublin on on this date; it states that Irish enemies and English rebels have conquered almost all of Limerick, Tipperary, Kilkenny, Wexford, Carlow, Kildare, Meath and Louth, so that hardly anything but Co. Dublin remains in the c
A great council meets at Dublin on on this date; it states that Irish enemies and English rebels have conquered almost all of Limerick, Tipperary, Kilkenny, Wexford, Carlow, Kildare, Meath and Louth, so that hardly anything but Co. Dublin remains in the c …

Revolt of Madog ap Llywelyn, Caernarfon Castle taken by Welsh rebels.
Revolt of Madog ap Llywelyn, Caernarfon Castle taken by Welsh rebels. At the end of the first building phase of Caernarfon Castle, the north wall of the castle had no wall, and was instead defended by the town walls and a wide rock cut ditch. Madog ap Llywelyn over-ran the castle through this ditch in his revolt of 1294 …