Church History · Lesson 8 · Era 2 (Medieval)
The One Chair
How the Bishop of Rome grew from an honored elder into the ruler of kings — the rise of the papacy.
📍 You are here: Era 2 · The Medieval Church — backfilling "Engine 2" from Lesson 7: where the Pope came from.
Why this matters for you: Last lesson you met the Pope mid-power and rightly asked, "where did this guy come
from?" Today we trace the lineage. This is the climb your Reformation reacts against — you can't understand
why Luther protests in 1517 until you see how high "the one chair" had climbed by then.
From Lesson 7: the 1054 split ran on two engines — a word (filioque) and a chair (the papacy).
You asked the right question: the Pope seemed to appear fully-formed. He didn't. The office (Bishop of Rome) is
ancient; the claim to rule the whole church took ~600 years to climb. Here's the staircase.
One idea unlocks the whole climb: when the Western Roman Empire collapsed, somebody had to govern —
and the Bishop of Rome was the last man standing. The papacy didn't seize power so much as inherit a vacuum.
Watch it rise, rung by rung.
Rung 0 · the root
Peter — the claimed foundation
Rome's later claim rests on Jesus' words to Peter: "You are Peter, and on this rock I will build my
church" (Matt 16:18). Tradition says Peter led the Roman church and was martyred there; every Bishop of Rome is called his successor. (Whether that verse means what Rome says — disputed; see below.)
Rung 1 · primacy of honor
First among equals — respected, not sovereign
Rome carries real prestige: the imperial capital, and the tomb of Peter and Paul. Other bishops
treat it with deep honor — but as an equal, not a ruler. No one yet thinks Rome commands the other churches.
Rung 2 · the claim is spoken
Leo the Great — first to claim full Petrine supremacy
The first Pope to argue clearly that the Bishop of Rome inherits Peter's authority over the whole church.
You've already met him: his "Tome" shaped the Definition at Chalcedon (451) — the same council that closed your Era 1 chain.
Legend adds that in 452 he rode out and turned Attila the Hun back from Rome.
⚡ 476 — the Western Roman Empire falls. In the East, the emperor keeps ruling. In the West, the empire is gone — and the vacuum is the papacy's growth spurt.
590–604
Gregory I "the Great"
Rung 3 · the first medieval pope
Gregory the Great — the Pope governs
Widely called the first truly medieval pope. With no emperor in the West, Gregory feeds Rome,
negotiates with invaders, and runs the city — and sends missionaries (Augustine of Canterbury to England, 597).
The Pope is now a ruler and a missionary strategist, not just a bishop. (Later boosted: in 800 the Pope crowns Charlemagne SHAR-leh-mayn emperor — the Pope as kingmaker.)
1073–85
Gregory VII (Hildebrand)
Rung 4 · the Pope over kings
Gregory VII — and the road to Canossa
In the Investiture Controversy in-VES-tih-cher, Gregory VII (born Hildebrand
HIL-deh-brand) fought Emperor Henry IV over who appoints bishops. He excommunicated the emperor —
who in 1077 stood barefoot in the snow at Canossa kah-NOSS-ah begging forgiveness.
The claim is now total: the Pope stands above kings. (Peak reached under Innocent III, 1198–1216.)
The climb in one breath: an
honored bishop (2nd c.) → a
claim to rule all (Leo, ~450) →
the Empire
falls (476) → the Pope
governs (Gregory the Great, ~600) → the Pope rules
over kings
(Gregory VII at Canossa, 1077).
The engine the whole time: the West's power vacuum. The Pope rose to fill what the fallen Empire left empty.
The honest question: did it grow, or was it always there?
You'll feel the tug between two readings of this exact same lineage. A good teacher shows you both:
The Catholic reading
The papacy was there in seed from Peter (Matt 16:18). It didn't start in the Middle Ages — it
unfolded, like an acorn becoming an oak. Leo and Gregory only articulated what was always true.
The Protestant & Orthodox reading
Rome had a real primacy of honor early — but the claim of supremacy (one bishop ruling all, over kings)
is a later development the undivided early church never recognized. The Orthodox East rejected it outright (hence 1054).
As a Protestant your instinct is the right-hand box — but notice you're both
reading the same staircase. The disagreement isn't about the dates; it's about whether the climb was an unfolding or an invention.
Honest history — a famous forgery. For centuries the papacy's claims were partly propped up by the "Donation of
Constantine" — a document claiming Emperor Constantine had handed the Pope authority over the Western empire. It was a
forgery, exposed in 1440 by the scholar Lorenzo Valla using the new tools of Renaissance history. A reminder that
even sacred institutions have messy paper trails — and that honest history checks its sources.
"Gregory I … is generally regarded as the founder of the medieval papacy." Leo I and Gregory I are the two popes
the church itself honors with the title "the Great."
— see Britannica — Gregory the Great
& Britannica — papacy;
cross-checked w/ Bruce Shelley, Church History in Plain Language.
Practice 1 — who climbed which rung?
Match each move to the right figure/moment. Instant feedback below.
Score: 0 / 7
Practice 2 — now teach it (out loud)
Trace the climb of "the one chair" to a beginner, without looking. Four prompts — say each aloud, then reveal.
- The starting point: what was the Bishop of Rome in the 2nd–3rd century?
Reveal ▸
Honored, "first among equals" — respected for Peter & Paul's tomb, but not ruling the other churches.
- The engine: what event let the Pope rise?
Reveal ▸
The fall of the Western Roman Empire (476) — the Pope filled the governing vacuum it left.
- Two "Greats": what did Leo and Gregory each add?
Reveal ▸
Leo I (~450): first to claim Petrine supremacy (and his Tome shaped Chalcedon). Gregory I (~600): first medieval pope — actually governed Rome and sent missionaries.
- The peak moment: the image of the Pope above kings?
Reveal ▸
Canossa, 1077 — Gregory VII (Hildebrand) makes Emperor Henry IV beg barefoot in the snow.
Run those four aloud and you've traced a 1,000-year lineage in a minute — and you'll see exactly what the Reformation pushes back against.
Ask me anything
Want the Matthew 16 "rock" debate unpacked (does "rock" mean Peter, or Peter's confession)? Curious how
Gregory the Great's missionaries Christianized England? Or what "investiture" actually means? Ask away — I'm your teacher.
Next we can branch a few ways through Era 2: the monasteries (Benedict & the monks who held the West together),
the scholastics (Anselm & Aquinas — faith seeking understanding), or the cracks that lead toward 1517
(Avignon, the Great Western Schism, Wycliffe & Hus — the "morning stars" of the Reformation). Say next and I'll pick the best fit, or name your branch.