The Saint Peters Basilica

Where is St. Peter’s Basilica?

Vatican City, within Rome

What architectural styles define the basilica?

Renaissance and Baroque

When did construction of the present basilica begin?

April 18, 1506

When was the present basilica completed?

1626; consecrated on November 18

Which pope commissioned the new basilica?

Pope Julius II

What building did it replace?

Old St. Peter’s Basilica, built under Emperor Constantine

Why was the basilica built at this site?

Tradition places St. Peter’s tomb beneath it

Who designed the original major plan?

Donato Bramante

What was Bramante’s original plan form?

A centralized Greek-cross plan

What defines a Greek-cross plan?

Four arms of approximately equal length

Who succeeded Bramante after his death?

Several architects, including Raphael and others

Which architect helped revise the plan after Bramante?

Raphael, who proposed a more longitudinal layout

Who became chief architect in 1546?

Michelangelo Buonarroti

What was Michelangelo’s major contribution?

He redesigned the central scheme and developed the dome design

What plan form did Michelangelo favor?

A more compact, centralized Greek-cross scheme

Did Michelangelo see the dome completed?

No; he died in 1564 before its completion

Who completed the dome after Michelangelo?

Giacomo della Porta, with Domenico Fontana

When was the dome’s vault completed?

1590

What is a dome’s lantern?

The raised structure at the dome’s crown that admits light

Where is the basilica’s main dome located?

Over the crossing, where nave and transept meet

What supports the central dome?

Four massive crossing piers

What is the basilica’s main exterior material?

Travertine is prominent on the façade

Who designed the present façade?

Carlo Maderno

When was the façade constructed?

Work began in 1607; it was completed in the early 1610s

Which pope commissioned Maderno’s façade?

Pope Paul V

What major change did Maderno make to the plan?

He extended the eastern nave, creating a Latin-cross layout

What defines a Latin-cross plan?

A long nave crossed by a shorter transept

What was one consequence of extending the nave?

The dome became less visible from the main approach

Who designed St. Peter’s Square colonnade?

Gian Lorenzo Bernini

When was Bernini’s colonnade built?

1656–1667

What is the shape of St. Peter’s Square colonnade?

Two sweeping, elliptical arms of columns

What symbolic idea does the colonnade express?

The Church embracing visitors and pilgrims

What is the Baldacchino?

Bernini’s monumental bronze canopy over the papal altar

Who designed the Baldacchino?

Gian Lorenzo Bernini, with workshop assistance

When was the Baldacchino completed?

1633

What is directly beneath the papal altar?

The traditional site of St. Peter’s tomb

What is the Cathedra Petri?

Bernini’s monumental composition enclosing the symbolic Chair of St. Peter

What is the crossing?

The intersection of the nave and transept

What is a nave?

The principal longitudinal space of a church

What is a transept?

The crosswise arm intersecting a church’s nave

What is an apse?

A rounded or polygonal termination, often at the altar end

What are pendentives used for?

They can transition from a square bay to a circular dome base

What is the basilica’s architectural significance?

It brings together major Renaissance and Baroque design contributions

What famous sculpture by Michelangelo is inside?

The Pietà

At what age did Michelangelo take charge of the project?

About 71–72 years old

What happened to the old basilica during rebuilding?

It was progressively dismantled as the new basilica rose

Why did construction take more than a century?

Multiple redesigns, successive architects, and changing papal commissions

Which architect is most associated with the dome’s design?

Michelangelo; della Porta and Fontana completed it.

Which architect is most associated with the square and colonnade?

Gian Lorenzo Bernini

The four key names in the basilica’s history:

Bramante: initial plan
Michelangelo: dome
Maderno: nave and façade
Bernini: square and Baroque features

Who commissioned the Old St. Peter’s Basilica?

Emperor Constantine, in the early 4th century

Who was the named architect of the Old Basilica?

Unknown; no architect is securely identified

What was the Old Basilica’s general plan?

A longitudinal early Christian basilica plan

What major feature lay at the Old Basilica’s western end?

The apse, associated with the altar and St. Peter’s tomb

Which pope promoted an early rebuilding project before 1506?

Pope Nicholas V, who initiated plans in the 15th century

Which architect was associated with Nicholas V’s rebuilding plans?

Bernardo Rossellino

Did Rossellino complete a replacement basilica?

No; the 15th-century rebuilding project remained incomplete

Who initiated the New Basilica’s construction in 1506?

Pope Julius II, who commissioned Donato Bramante’s design

What was Fra Giovanni Giocondo’s role?

He contributed to early design and construction work after Bramante

What was Giuliano da Sangallo’s role?

He helped develop and revise early plans for the New Basilica

What did Raphael do after Bramante died?

He became chief architect and proposed a more longitudinal plan

What was Baldassarre Peruzzi’s contribution?

He developed alternative centralized design schemes after Raphael.

Who was Antonio da Sangallo the Younger?

Chief architect who developed a complex design and large wooden model

What was notable about Sangallo the Younger’s model?

It presented an elaborate alternative scheme for the basilica

What construction challenge did Sangallo address?

The dome’s structural support and the size of its supporting piers

What was Giulio Romano’s connection to the project?

He was among the architects involved during the succession of Renaissance designs

What did Michelangelo simplify?

Earlier proposals, restoring emphasis to a compact centralized plan

Which parts did Michelangelo principally shape?

The central crossing, dome design, and much of the exterior

What was Jacopo Barozzi da Vignola’s role?

He continued architectural work on the basilica after Michelangelo

Who was Pirro Ligorio?

An architect involved in the project after Michelangelo’s death

What did Giacomo della Porta complete?

The dome, following Michelangelo’s design, with Domenico Fontana

What was Domenico Fontana’s role in the dome?

He collaborated with della Porta to construct the dome in 1588–1590

Who was Giovanni Fontana?

An architect associated with later construction work alongside Carlo Maderno

What was Carlo Maderno’s main contribution?

He extended the nave and designed the monumental façade

Why did Maderno extend the nave?

To accommodate a larger congregation and create a longitudinal church

What plan resulted from Maderno’s extension?

A Latin-cross plan, replacing the intended compact Greek-cross emphasis

What was Bernini’s role beyond St. Peter’s Square?

He designed major interior works, including the Baldacchino and Cathedra Petri

Who commissioned Bernini’s St. Peter’s Square?

Pope Alexander VII commissioned the famous colonnaded piazza

Which architectural period followed the Renaissance work?

The Baroque period, especially in Maderno’s and Bernini’s contributions

What is the key lesson about the basilica’s authorship?

It was a collaborative project shaped by successive architects and popes

What role did Fra Giovanni Giocondo play at St. Peter’s?

He was among the architects consulted during the early design revisions

What else was Fra Giovanni Giocondo known for?

A Renaissance humanist, architect, engineer, and scholar of classical architecture

How was Baldassarre Peruzzi involved in St. Peter’s?

He helped develop alternative designs after Bramante’s death

What planning idea is associated with Peruzzi’s proposals?

A centralized scheme emphasizing geometric order and the Greek-cross plan

Why was Pirro Ligorio involved in St. Peter’s?

He succeeded Michelangelo as chief architect in 1564

What happened during Ligorio’s leadership?

He held the post briefly before being replaced by Giacomo della Porta

What was Francesco Borromini’s connection to St. Peter’s?

He collaborated with Bernini on the design and execution of the Baldacchino

Was Borromini a chief architect of the basilica?

No. He was a collaborator on Baroque work, not a chief architect of the main building