science

Theophilus

Theophilus is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Theophilus rather than just read about it. In short: Theophilus is a male given name with a range of alternative spellings. Its origin is the Greek word Θεόφιλος from θεός (theós, "God") and φιλία (philía, "love or affection") can be translated as "Love of God" or "Friend of God", i.e., it is a theophoric name, synonymous with the name Amadeus which originates from Latin, Gottlieb in German and Bogomil or Bogumił in Slavic.

Key takeaways

Theophilus belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Theophilus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Theophilus from memory before moving on to harder problems.

Reference excerpt

Theophilus is a male given name with a range of alternative spellings. Its origin is the Greek word Θεόφιλος from θεός (theós, "God") and φιλία (philía, "love or affection") can be translated as "Love of God" or "Friend of God", i.e., it is a theophoric name, synonymous with the name Amadeus which originates from Latin, Gottlieb in German and Bogomil or Bogumił in Slavic. Theophilus may refer to:

People

Ancient rulers Theophilos (emperor) (c. 812–842), Byzantine Emperor (reigned 829–842), the second of the Phrygian dynasty Theophilus (Indo-Greek) (fl. 130 or 90 BC), Indo-Greek king

Ancient and medieval authors Theophilus (geographer), ancient Greek geographer Theophilus (jurist) (fl. 533), one author of the Institutes of Justinian Theophilus of Edessa (695–785), medieval astrologer and scholar Theophilos Erotikos (10th century), Byzantine jurist and geometer Theophilus Presbyter (1070–1125), Benedictine monk, author, metallurgist, artist and armourer — thought to be a pseudonym of Roger of Helmarshausen Theophilus Protospatharius, (c. 7th century), Byzantine medical writer

Artists Theophilus Cibber (1703–1758), English actor, playwright, author, son of the actor-manager Colley Cibber Theophilus Clarke (1776?–1831), English painter Theophilos Hatzimihail (c. 1870–1934), Greek folk painter from Lesbos Theofilos (film), a 1987 Greek film

Military Theophilos Erotikos (fl. 1034–1042), Byzantine general and governor, rebel in Cyprus Theophilus H. Holmes (1804–1880), Confederate general in the American Civil War Theophilos Kourkouas (920–970), Byzantine general, grandfather of emperor John I Tzimiskes Theophilus Weeks (1708–1772), soldier in the French and Indian War

Musicians Theophilus London (born 1987), Trinidadian-American vocalist Theophilus Martins (born 1987), American rapper, DJ, and model

Politics Theophilus Bradbury (1739–1803), U.S. Representative from Massachusetts Theophilus Eugene Connor (1897–1973), Birmingham, Alabama's Commissioner of Public Safety during the American Civil Rights Movement Theophilus Daniel (1817–1893), New Zealand politician Theophilus Danjuma (born 1938), influential Nigerian soldier and politician Theophilus Eaton (1590–1658), merchant, farmer, Puritan colonial leader, co-founder and first governor of New Haven Colony, Connecticut Theophilus Howard, 2nd Earl of Suffolk (1584–1640), English nobleman and politician Theophilus F. Metcalf (1816–1891), American farmer and politician Theophilus Shepstone (1817–1893), British South African statesman Theophilus Williams (1824–1904), mayor of Ballarat

Religious leaders Theophilus (biblical), person to whom the Gospel of Luke and the Acts of the Apostles were addressed Theophilus ben Ananus, High Priest of Israel. Theophilus of Antioch (died c. 183), Christian apologist and Patriarch of Antioch Theophilus, bishop of Caesarea (fl. 195) Theophilus the Deacon, martyr from Libya Theophilus (bishop of the Goths), first known Gothic bishop, participant of the First Council of Nicaea in 325 Theophilos the Indian (fl. 354–364), Arian bishop, also called "the Ethiopian", probably from the Maldive Islands Patriarch Theophilus (disambiguation) Theophilus I of Alexandria (died c. 412), 23rd Pope of Alexandria Theophilus of Adana (fl. 538), bishop who made a pact with the devil Theophilus Gale (1628–1678), English nonconformist divine Theophilus Gates (1787–1846), American religious leader Theophilus Herter (1913–1987), American Anglican bishop Theophilus Lindsey (1723–1808), English theologian Theophilus, a pagan lawyer converted by Saint Dorothea of Caesarea at the scene of her execution, martyr

Other Theophilus Carter (1824–1904), British inventor and furniture dealer Theophilus Cazenove (1740–1811), Dutch financier and one of the agents of the Holland Land Company Theophilus Metcalfe (bap. 1610–c. 1645), English stenographer who invented a popular shorthand system Theophilus Redwood (1806–1892), Welsh pharmacist

Theophila Theophila is a female version of the name.

Theophila Gwatkin (1757–1848), British painter Theophila Townsend (1656–1692), Quaker writer and activist

Fictional characters Theophilus, one of Leibniz's interlocutors in his book New Essays on Human Understanding Professor Theophilus Branestawm, the protagonist of the Professor Branestawm series of children's books Theophilus Goon, a policeman in Enid Blyton's Five Find-Outers series of children's mystery novels Dr. Theophilus Grantly, in Anthony Trollope's novel Barchester Towers Theophilus Msimangu, in Alan Paton's Cry, the Beloved Country Theophilus North, title character in Thornton Wilder's last novel (1973) Dr. Theophilus Tanner, from the Deathlands series of books Theophilus Thistle, in a noted tongue-twister Theophilus P. Wildebeeste, created by Lenny Henry Theophilus (comic strip), the title character of a religious comic strip (1966–2002)

See also Theofelus, surname and given name Theophil, a given name Teófilo, a given name Theophilia, the love or favour of God Jedediah, a given name also meaning "Friend of God" Godwin (disambiguation), the equivalent Anglo-Saxon name Guðni, the Icelandic form of the name

Worked examples

Example 1 — a first encounter with Theophilus

Start with the simplest possible case. Write down what Theophilus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Theophilus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Theophilus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Theophilus

In research: Theophilus appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Theophilus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Theophilus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Given names, Given names of Greek language origin, Greek masculine given names, so understanding it makes those chapters shorter.
In everyday life: Look for Theophilus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Theophilus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Theophilus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Theophilus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Theophilus in simple terms?

Why does Theophilus matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Theophilus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Theophilus.