What happened on April 30 ?

Holidays

Scandinavia - The arrival of spring, Walpurgis Night.

Sweden - Birthday of King Carl XVI Gustav, an official flag day.

The Netherlands - Queen's Day.

Roman Empire - third day of the Floralia in honor of Flora.

Bealtaine Eve (From either Irish Bealtaine or Scottish Gaelic). Originally a Celtic Druid holiday.

Vietnam - Liberation Day.

Mexico - Children's Day.

LaVeyan Satanism - Walpurgisnacht, or Walpurgis Night, as noted in The Satanic Bible.

Saint Eutropius

Saint Maximus, 3rd century martyr

Saint Marianus and James, martyrs in Numidia in 259

Saint Suitbert the Younger (d. 807)

Saint Joseph Benedict Cottolengo

Saint Pope Pius V

Blessed Hildegard

Blessed Radolf of Affligem

Blessed Rosemonde