June 15
Overview
Holidays & Observances
Arbor Day (Costa Rica)
Arbor Day in Costa Rica encourages citizens to plant and care for trees nationwide, fostering environmental stewardship and community engagement.
Christianfeast day:
Abraham of Clermont (or of St Cyriacus), Alice (or Adelaide) of Schaerbeek, Augustine of Hippo(Eastern Orthodox Church), BlessedAlbertina Berkenbrock, BlessedClement Vismara, Edburga of Winchester, Evelyn Underhill(Church of EnglandandThe Episcopal Church), Germaine Cousin, Landelin (of Crespin or of Lobbes), Trillo, Vitus (Guy), Modestus and Crescentia, June 15 (Eastern Orthodox liturgics)
Various Christian denominations commemorate multiple saints on June 15, honoring their faith, service, and theological contributions.
Day of ValdemarandReunion Day(Flag Day) (Denmark)
Denmark's Day of Valdemar and Reunion Day, marked as Flag Day, celebrates historical reunification and national unity each June 15.
Engineer's Day (Italy)
Italy's Engineer's Day honors the nation's engineering professionals and their contributions to innovation and infrastructure.
Global Wind Day(international)
Global Wind Day is an international observance celebrating wind energy’s role in a sustainable and low-carbon future.
National Beer Day (United Kingdom)
National Beer Day in the UK celebrates beer's cultural heritage and the liberalization of beer sales on June 15, 1830.
National Salvation Day(Azerbaijan)
Azerbaijan's National Salvation Day commemorates the restoration of stability and independence on June 15, 1993.
Abraham of Clermont (or of St Cyriacus)
Feast day of Abraham of Clermont, a 6th-century monastic founder and ascetic, observed on June 15.
Alice (or Adelaide) of Schaerbeek
Feast day of Alice of Schaerbeek, a 13th-century Cistercian nun celebrated for her devotion and charity.
Events
Assyrians record a solar eclipse that is later used to fix the chronology of Mesopotamian history.
Assyrian astronomers recorded a solar eclipse that has become a crucial anchor for Mesopotamian chronology.
Louis II is crowned as king of Italy at Rome by pope Sergius II.
Louis II, grandson of Emperor Lothair I, was crowned King of Italy by Pope Sergius II at St. Peter's Basilica in Rome.
Battle of Soissons: King Robert I of France is killed and King Charles the Simple is arrested by the supporters of Duke Rudolph of Burgundy.
In the Battle of Soissons, Robert I of France was slain and Charles the Simple imprisoned as supporters of Duke Rudolph of Burgundy seized power.
The naval Battle of Fimreite is won by the Birkebeiner pretender Sverre Sigurdsson. Sigurdsson takes the Norwegian throne and King Magnus V of Norway is killed.
Sverre Sigurdsson won the naval Battle of Fimreite, killing King Magnus V and securing his claim to the Norwegian throne.
King John of England puts his seal to Magna Carta.
King John of England affixed his seal to the Magna Carta, granting liberties that laid the groundwork for constitutional governance.
Northern Crusades: Danish victory at the Battle of Lindanise (modern-day Tallinn) establishes the Danish Duchy of Estonia.
Danish forces triumphed at Lindanise, founding the Duchy of Estonia and extending crusader influence in the Baltic region.
With the death of Frederick II, Duke of Austria, the Babenberg dynasty ends in Austria.
The death of Frederick II, Duke of Austria, ended the Babenberg dynasty and triggered a power struggle in Central Europe.
The Tiepolo conspiracy, seeking to seize power in the Republic of Venice, is thwarted after bloody street clashes in Venice. The suppression of the revolt will lead to the creation of the Council of Ten.
A failed coup by the Tiepolo family in Venice was crushed, leading to the formation of the powerful Council of Ten.
At the Battle of Rozgony, King Charles I of Hungary wins a decisive victory over the family of Palatine Amade Aba.
Charles I of Hungary defeated the forces of Palatine Amade Aba at the Battle of Rozgony, solidifying his royal authority.
Births
Edward
He was the eldest son of King Edward III of England and famously known as the Black Prince. He became one of the most celebrated military commanders of the Hundred Years' War.
Lisa del Giocondo
Italian noblewoman believed to be the subject of Leonardo da Vinci's Mona Lisa, one of the most iconic portraits in art history.
Henry FitzRoy
Illegitimate son of Henry VIII, created Duke of Richmond and Somerset and served briefly as Lord Lieutenant of Ireland.
Richard Grenville
English sea captain and explorer who led early expeditions to the Americas and fought against the Spanish Armada.
Elizabeth Knollys
English court noblewoman who served as a gentlewoman in Queen Elizabeth I’s Privy Chamber and held significant influence at the Elizabethan court.
Archduke of Austria and Governor of the Spanish Netherlands, who governed Tyrol and promoted Habsburg interests in Europe.
Thomas Randolph
English poet and playwright of the early 17th century known for his witty comedies and lyrical verses.
Cornelis de Witt
Leading Dutch statesman of the Golden Age who served as Grand Pensionary of Dordrecht and championed the republican cause.
Hiob Ludolf
German orientalist and philologist who pioneered European studies of Ethiopian languages and culture.
Deaths
King of West Francia from 922 to 923, he defended his realm against Viking invasions and strengthened the foundations of royal authority.
Romanos I Lekapenos
Byzantine Emperor from 920 to 944, he rose from humble origins to lead the empire through military and economic revival.
Murong Yanchao
A prominent general during the Five Dynasties and Ten Kingdoms period, noted for his bold military campaigns and strategic skill.
Eadburh of Winchester
Anglo-Saxon princess of Winchester, venerated as a saint for her piety, charitable works, and foundation of religious institutions.
Adalbert
10th-century Bishop of Passau, remembered for his dedication to church reform and missionary outreach in Bavaria.
Theophanu
Empress consort of the Holy Roman Empire and regent for her son, she bridged Byzantine and Western traditions in the late 10th century.
The 71st Emperor of Japan, noted for his administrative reforms to reduce the power of court nobility and strengthen the imperial household.
Magnus Erlingsson
King of Norway from 1161 to 1184, he was the first Norwegian monarch crowned in a Christian ceremony, symbolizing the church’s growing influence.
Minamoto no Yoshitsune
Legendary samurai commander famed for his ingenious strategies in the Genpei War, securing key victories for the Minamoto clan.