All events in May :  

Births:

1 . John I, Count of Hainaut was born 1. May 1218. (died 1257)

2 . Rudolph I of Germany , was born 1. May 1218. (died 1291)

3 . Jean de Joinville, French author was born 1. May 1225. (died 1317)

4 . Edmund FitzAlan, 9th Earl of Arundel, English politician was born 1. May 1285. (died 1326)

Deaths:

1 . Arcadius, Byzantine emperor died 1. May 408. (born 337)

2 . Matilda of Scotland , died 1. May 1118. (born 1080)

3 . Stephen Uroš I of Serbia , died 1. May 1277. (born 1223)

4 . Albert I of Germany , died 1. May 1308. (born 1255)

Events:

1 . Diocletian and Maximian retire from the office of Roman Emperor. (1. May, 305)

2 . King Sigismund of Burgundy is executed at Orléans after an 8-year reign and is succeeded by his brother Godomar. (1. May, 524)

3 . The Nea Ekklesia is inaugurated in Constantinople, setting the model for all later cross-in-square Orthodox churches. (1. May, 880)

4 . Wars of Scottish Independence end: By the Treaty of Edinburgh-Northampton the Kingdom of England recognises the Kingdom of Scotland as an independent state. (1. May, 1328)