Medieval Literature & Grammar for a 17‑Year‑Old: Mabinogion, Marie de France, Chaucer, Treatise on the Astrolabe — Sentence Diagramming Exercises

Overview — Why these texts matter

These four works are gateways into medieval literature, culture, and language, each showing a different side of the Middle Ages:

• The Mabinogion — a collection of medieval Welsh tales (myth, legend, courtly adventure). Great for themes of fate, magic, heroism, and courtly society.
• Marie de France — 12th‑century poet who wrote short narrative poems (lais) about love, honor, and the supernatural. Her writing is concise and excellent for studying narrative technique.
• Geoffrey Chaucer — 14th‑century English poet (The Canterbury Tales). Chaucer shows early Middle English and a strong voice in character‑driven storytelling.
• Treatise on the Astrolabe (by Chaucer) — an instructional, prose technical manual. It shows medieval prose, technical vocabulary, and clear, logical structure.

How grammar and sentence diagramming help reading these texts

Diagramming sentences forces you to identify the grammatical roles of words and clauses (subject, verb, object, modifiers, and subordinate clauses). That skill helps when:

• Parsing unusual word order in translations or older English.
• Understanding complex sentences in Chaucer and in scholastic prose like the Astrolabe treatise.
• Seeing how authors build emphasis and style (e.g., fronting adverbial phrases or using subordinate clauses for detail).

Quick grammar refresher (short, practical)

• Subject — who or what performs the action (or is described).
• Verb (predicate) — the action or state of being.
• Direct object — who/what receives the action of a transitive verb.
• Indirect object — to/for whom the action is done.
• Subject complement — renames or describes the subject (predicate nominative/adjective after linking verb).
• Modifiers — adjectives and adverbs; prepositional phrases act as modifiers (time, place, manner, etc.).
  • Prepositional phrase = preposition + object (and any modifiers of that object).
• Independent clause — can stand alone as a sentence. Dependent (subordinate) clause cannot and functions as an adverb, adjective (relative), or noun.

How to diagram (Reed‑Kellogg style, in 4 clear steps)

1. Find the main clause: Locate the main subject and main verb (the independent clause that forms the backbone of the sentence).
2. Label objects/complements: Ask "who/what" after the verb to find direct objects; ask "to/for whom" for indirect objects; check for linking verbs with subject complements.
3. Attach modifiers: Put adjectives under the noun they modify, adverbs under the verb, and prepositional phrases on slanted lines under the word they modify.
4. Deal with subordinate clauses: Treat them like single units attached where they function (as an adverb, adjective, or noun). If the subordinate clause has its own subject and verb, show that internal structure on a secondary baseline.

Practice sentences (graded, with step‑by‑step diagrams and answers)

Note: the diagrams below use a simple ASCII/Reed‑Kellogg style. The vertical bar "|" separates subject from verb; modifiers are shown below with labels.

Exercise 1 — Simple sentence (basic)

Sentence: "The knight rode."

Step‑by‑step:

1. Subject: The knight
2. Verb: rode (intransitive; no object)
3. No objects or complements; no modifiers besides "The" (article).

The knight | rode
  (article)

Exercise 2 — With direct object

Sentence: "The queen praised the brave knight."

Steps:

1. Subject: The queen
2. Verb: praised
3. Direct object: the brave knight ("brave" modifies "knight")

The queen | praised | the brave knight
            \            (adjective)
             \-- direct object

Exercise 3 — Prepositional phrase modifier

Sentence: "Pwyll became lord of Dyfed." (Mabinogion context)

Steps:

1. Subject: Pwyll
2. Verb: became (linking verb)
3. Subject complement: lord (predicate noun)
4. Modifier of the complement: prepositional phrase "of Dyfed" (shows which lord)

Pwyll | became | lord
             \       \-- of Dyfed (prepositional phrase modifying "lord")
              \-- predicate nominative (subject complement)

Exercise 4 — Adverbial clause + main clause

Sentence: "When the moon rose, the sailors navigated by the stars."

Steps:

1. Identify the adverbial subordinate clause: "When the moon rose" — modifies the main verb "navigated" (answers when).
2. Main clause: the sailors (subject) | navigated (verb) | by the stars (prepositional phrase, adverbial of manner/means).

When the moon rose,         the sailors | navigated
(subject: the moon)             (main subject)
(verb: rose)
                              \-- by the stars (prepositional phrase modifying "navigated")
(adverbial clause modifying the main verb)

Exercise 5 — Relative clause (adjective clause)

Sentence: "Marie told a lai that praised true love."

Steps:

1. Subject: Marie
2. Verb: told
3. Direct object: a lai
4. The relative clause "that praised true love" modifies "lai" (it tells which lai).

Marie | told | a lai
            \      \-- that praised true love (relative clause modifying "lai")
             \-- direct object

Exercise 6 — Compound sentence with coordination

Sentence: "Chaucer wrote his treatise, and students learned from it."

Steps:

1. Two independent clauses joined by coordinating conjunction "and".
   • Clause 1: Chaucer (subject) | wrote (verb) | his treatise (direct object).
   • Clause 2: students (subject) | learned (verb) | from it (prepositional phrase functioning adverbially).

Chaucer | wrote | his treatise , and | students | learned | from it
              \-- DO                     (coord. conj.)   \-- adv. prep. phrase

Tips for using real medieval sentences

• Start with modernized translations. Diagram those first, then compare to the original if you like.
• Watch for inverted word order in poetry or older prose (e.g., adjectives before nouns, or verbs placed at ends). Always ask: who is doing what?
• For the Treatise on the Astrolabe, look for instruction structure: imperative verbs, step lists, and technical nouns. Diagraming helps make the steps explicit.
• Mark archaic words in the margin and translate them before diagramming — unfamiliar vocabulary can hide the sentence skeleton.

More practice (try these on your own)

1. "The knight returned to his lord after the battle."
2. "Marie wrote a short poem that moves the reader."
3. "The astrolabe shows the height of a star when you sight along its rule."
4. "Although the road was long, the pilgrims arrived cheerful."

For each: identify the main clause, then label subject, verb, objects/complements, and modifiers. Diagram subordinate clauses as single units attached where they function.

Answers — quick keys

1. Subject: The knight | Verb: returned | Prepositional phrase: to his lord (adverb of place) | Adverbial phrase: after the battle (adverb of time).

2. Subject: Marie | Verb: wrote | Direct object: a short poem | Relative clause: that moves the reader (modifies poem).

3. Subject: The astrolabe | Verb: shows | Direct object: the height of a star ("of a star" is a modifying prepositional phrase) | Adverbial clause: when you sight along its rule (modifies shows).

4. Subordinate concessive clause: Although the road was long (adverbial) | Main clause: the pilgrims (subject) | arrived (verb) | cheerful (subject complement/adverbial description).

Final notes — making this useful

Spend 10–20 minutes per day diagramming sentences from a text you're reading. Start simple, then do one complex sentence each session. Over a few weeks you'll notice: parsing old sentence structures becomes faster, comprehension improves, and you start to see how medieval writers build meaning.

If you want, I can: provide more exercises drawn directly from a short passage of the Mabinogion, a lai by Marie de France, a Canterbury Tale excerpt, or Chaucer's Astrolabe (modernized) and walk you through diagrams sentence by sentence.