Sixtus IV was a leader. 

Sixtus IV was a powerful leader. 
He lived a long time ago. He was the head of the church. He also ruled a large area of land.
He loved to build things in Rome. He built a famous chapel. He also made a large library. 
He helped fix the city. He fixed old roads and bridges. He even fixed a way to bring clean water to the city.
He also helped many artists. They made beautiful art for him. He was a very busy man. 
Sixtus IV was a leader in the Catholic Church. 
He lived in the 1400s. He was born Francesco della Rovere. He was a scholar who studied philosophy. He also taught at many Italian universities. Later, he became a cardinal. Finally, he was elected Pope. 
Sixtus IV did many big things in Rome. He built the Sistine Chapel. He also made the Vatican Library. He helped many artists make new art. He fixed many old churches in the city. He built a new bridge called Ponte Sisto. He even fixed a way to bring clean water to Rome. 
He also focused on his own family. This is called nepotism. He gave many jobs to his relatives. He made his nephews very rich and powerful. Some people in his time did not like this. He also made rules that started the Spanish Inquisition. He used his power to help his family gain more land. This made some other leaders angry with him.
Pope Sixtus IV was a major leader of the Catholic Church. 

Sixtus IV did many big things to change Rome. He was a great patron of the arts. This means he gave money to help artists create beautiful work. He helped bring the early Renaissance style to the city. He started the building of the famous Sistine Chapel. He also created the Vatican Library to hold many books. To help the city, he rebuilt over 30 old churches. He also built the Ponte Sisto bridge across the Tiber River. He even fixed the Acqua Vergine to bring clean water to Rome.
One big part of his rule was helping his own family. This practice is called nepotism. Sixtus IV gave many important jobs to his relatives. He made six of his thirty-four cardinals his own nephews. His nephew Pietro Riario became very rich and powerful in Rome. Pietro even helped run the city for a time. Some people in history criticized Sixtus for this. They felt he cared too much about his family's power. He used his position to help his family gain land and wealth.
Sixtus IV also made important rules for different lands. In 1478, he created the Spanish Inquisition through a special document. He did this because of political pressure from Spain. He also had many disagreements with other kings and leaders. He fought with King Louis XI of France over church rules. He also had conflicts with leaders in Venice and Florence. One famous event was the Pazzi conspiracy in Florence. This was a plot to remove the Medici family from power. Sixtus was personally involved in this difficult time.
His life shows how much one person can change a city. He left behind many buildings that people still see today. His family, the Della Rovere, stayed powerful for a long time. The line of dukes in Urbino lasted until the year 1631. Even though he was a controversial leader, his work changed Rome. He helped turn the city into a center for art and learning. We can still see his impact in the streets and churches of Italy. 
Pope Sixtus IV was a major leader of the Catholic Church. He served as the head of the Church and ruler of the Papal States from 1471 until 1484. Born Francesco della Rovere, he was a member of the Della Rovere family. He was born in the town of Celle Ligure near Savona. Before his rise to power, he was a dedicated scholar. He studied philosophy and theology at the University of Pavia. He later lectured at Padua and various other Italian universities. His reputation for piety helped him get elected by the College of Cardinals. This election followed the unexpected death of Pope Paul II, who was fifty-four years old.

Upon his election, he took the name Sixtus IV. This name had not been used since the 5th century. His early actions included declaring a renewed crusade against the Ottoman Turks in Smyrna. However, the fleet disbanded after the conquest of Smyrna. He also made efforts to unify with the Greek Church, though these attempts were unsuccessful. Much of his later work focused on temporal issues and his own dynasty. He was a massive patron of the arts. He helped bring the early Renaissance into Rome. His support helped create the first masterpieces of this new artistic age. 
Sixtus IV is famous for his work in Rome. He sponsored the construction of the Sistine Chapel. He also created the Vatican Library. He rebuilt or restored over 30 dilapidated churches, such as San Vitale and Santa Maria del Popolo. He added seven new churches to the city. He also built the Ponte Sisto, which was the first new bridge across the Tiber since Antiquity. To improve public health, he restored the Acqua Vergine aqueduct. This provided Rome with an alternative to river water. He also built the Via Sistina, a road leading from Castel Sant'Angelo to Saint Peter. 
One major part of his rule involved nepotism. Nepotism is when a leader gives jobs and power to relatives. Sixtus IV sought to strengthen his position by surrounding himself with family. He appointed six of his thirty-four created cardinals as his nephews. His nephew Pietro Riario became very powerful. Pietro was made a cardinal and the bishop of Florence. He was also the Patriarch of Constantinople. He received 45 additional benefices, which are grants or offices. Pietro became one of the richest men in Rome. He was even the de facto ruler of Rome for a time. 
Pietro's spending was quite large. He reportedly spent 200,000 gold ducats on food and festivals in just two years. He hosted a reception for Eleonora of Aragon that included many expensive decorations. This feast featured edible statues of Hercules, Bacchus, and Ariadne made from sweets. Pietro died prematurely in 1474. His death was seen by some chroniclers as unnatural. This was due to his massive spending habits. After Pietro, the role of family influence passed to Giuliano Della Rovere. He was another nephew of the Pope.
Sixtus IV was also involved in complex politics. In 1478, he created the Spanish Inquisition. He did this through a document called the papal bull Exigit Sinceræ Devotionis. He acted under political pressure from Ferdinand of Aragon. Ferdinand threatened to withhold military support for the kingdom of Sicily. Sixtus also dealt with the Pazzi conspiracy in 1478. This was a plot to remove the Medici family from power in Florence. His nephew, Cardinal Raffaele Riario, was suspected of helping this plot. Sixtus responded to this event with an interdict and two years of war against Florence.
His religious work included promoting the dogma of the Immaculate Conception. In 1476, he issued the constitution Cum Praeexcelsa to establish a special Mass for it. He also confirmed the rights of the Portuguese to acquire slaves through the bull Aeterni regis in 1481. This followed earlier bulls from Pope Nicholas V. His reign left a lasting mark on the world. The Della Rovere family remained powerful for a long time. Their line of dukes in Urbino lasted until 1631. Even his critics, like the chronicler Stefano Infessura, admitted he was a great civic patron. He truly transformed the landscape of Rome.
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