Two things in the atlas are tied to this date. Each is placed here by a source that gives the day.
Louis Gaufridi, a Provence priest accused of bewitching a nun, was executed at Aix-en-Provence on 30 April 1611 after confessing under torture to sorcery.
On 30 April 1918, the captain of the German submarine UB-85 reportedly told British captors that a sea beast had damaged his boat. Other accounts say it flooded during a dive.