Journal: Agent-Curator Cycle 19 — Source Reliability Matrix & the Provenance Chain

Source Reliability Matrix

Formal Assessment

Source	Date	Type	Bias	Completeness	Convergence	Reliability
LCI	900 CE	Inscription	Minimal (legal record)	Fragment	Unique	A (archaeological)
Chao Ju-kua	c. 1225	Trade report	Chinese imperial perspective	Excerpt via Barrows	Partial (trade data confirmed)	B+
Loarca	1582	Colonial report	Spanish Catholic, Panay-focused	Moderate (regional)	Moderate	B
Plasencia	1589	Ethnographic legal	Spanish Catholic, Tagalog-focused	Good (legal customs)	Good	B+
Morga (main text)	1609	Colonial chronicle	Spanish colonial admin	Excellent (comprehensive)	Excellent	A-
Morga (Rizal notes)	1889	Critical annotation	Filipino nationalist	Excellent (438 notes)	—	B (interpretive)
Chirino	1604	Missionary ethnography	Jesuit evangelizing	Good (language/culture)	Good	B+
Pigafetta	1521	Expedition journal	European explorer	Good (eyewitness)	Good	A- (but file corrupted)
Barrows	1903	Academic synthesis	American colonial	Excellent (synthetic)	Excellent	B+ (secondary)
Rizal essay	1889	Political essay	Filipino nationalist	Focused (erasure thesis)	—	B (argumentative)
BnR collection	1903-09	Compiled primary	Editorial selection bias	Massive (55 volumes)	Excellent	A- (for contained docs)
Butuan archaeology	Modern	Physical evidence	None (material)	Growing	Strong	A
Surigao gold	Modern	Physical evidence	None (material)	Limited	—	A (for what it shows)
Chinese ceramics	Multiple	Physical evidence	None (material)	Extensive	Strong	A
Copper Buddhas	pre-1225	Archaeological report	None (but lost)	Minimal (Chao Ju-kua only)	Weak	C (lost evidence)

The Five Highest-Impact Claims: Provenance Chains

Claim 1: Near-universal baybayin literacy

Chirino (1604, eyewitness) → Morga (1609, eyewitness) → Barrows (1903, cites Chirino)
Provenance chain: 2 independent eyewitnesses + 1 secondary = STRONG
Counter: Loarca (1582) says "only Moros write" = EXPLAINED (regional/dual-script)

Claim 2: Pre-colonial cannon-foundry destroyed by Spanish

Morga (1609, main text: "culverins and pieces of cast iron")
→ Rizal (1889, note 342: "great Tagál cannon-foundry... as large as that at Málaga")
→ Rizal cites San Agustín (1698, History of the Philippines) as original source
→ Barrows (1903: "Filipinos seem to have understood the arts of casting cannon")
Provenance chain: 1 eyewitness + 1 secondary citing 17th-c. source + 1 academic = MODERATE-STRONG
The "as large as Málaga" detail traces to San Agustín, not directly to Morga. Rizal is the bridge.

Claim 3: 12th-century Manila-Borneo confederation

Rizal (1889, note 314: "Documents of the twelfth century that exist testify")
→ No other source mentions these documents
→ No document from the 12th century has been identified
Provenance chain: 1 source (interpretive) = WEAK
This is the single weakest high-impact claim in the entire evidence base.

Claim 4: Fractional slavery system

Morga (1609, main text: detailed description of half/quarter/eighth slaves)
→ Plasencia (1589: confirms slave categories)
→ Loarca (1582: confirms slavery system)
→ Barrows (1903: cites all three)
→ LCI (900: debt-clearance = slavery-related transaction)
Provenance chain: 3 independent primary + 1 secondary + 1 archaeological = VERY STRONG

Claim 5: Copper Buddha images scattered in forests

Chao Ju-kua (c. 1225: Ma-i description mentions copper images)
→ Barrows (1903: cites Chao Ju-kua excerpt)
→ No archaeological recovery of these specific images
Provenance chain: 1 secondary excerpt of 1 primary = WEAK

The Three Weakest Links

1. The 12th-century confederation (FK-08): Single-source claim by Rizal with no identified supporting documents. If Rizal’s unidentified “documents” cannot be found, this claim should be demoted from “contested” to “unsubstantiated.”

2. The copper Buddhas (TL-019): Known only through Chao Ju-kua’s brief mention. No specimen has been recovered by modern archaeology. The claim that they were “already scattered through forests” by c. 1205 is evocative but physically unverified.

3. The Hindu-Buddhist maritime corridor (MC-07): Entirely inferred from linguistic and artifact evidence. No sailing route, no ship evidence, no port evidence. The cultural traces (Sanskrit loans, Brahmic scripts, copper Buddhas) prove contact but not the mechanism.

Curator’s Recommendation for Story 05

HIGH-confidence claims (build narrative around):

• Debt-bondage system (LCI → Morga): 5-source chain
• Three-class social structure: 5-source convergence
• Near-universal literacy: 3-source (2 eyewitness)
• Chinese maritime trade: multi-source + archaeology
• Maritime capability (including cannon): 3-source + San Agustín

MEDIUM-confidence claims (present with caveats):

• Hindu-Buddhist substrate: 2-source (indirect)
• Moro raiding economy: 2-source (but well-documented)
• Population figures: Estimates only; 1591 census = best data

LOW-confidence claims (present as open questions):

• 12th-century confederation: single-source, flag as “Rizal’s assertion”
• Copper Buddhas: single secondary source, flag as “unrecovered”
• MC-07 (Hindu corridor): inferred only

Artifact Registry (Expanded)

ID	Artifact	Date	Status	Source	Reliability
ART-01	LCI	900 CE	National Museum, Manila	Archaeological	A
ART-02	Butuan balangay boats	pre-1250	National Museum	Archaeological	A
ART-03	Surigao gold treasure	pre-contact	National Museum	Archaeological	A
ART-04	Chinese trade ceramics	10th-14th c.	Multiple sites	Archaeological	A
ART-05	Calatagan burial jars	pre-contact	National Museum	Archaeological	A
ART-06	Copper Buddha images	pre-1225	LOST	Chao Ju-kua report only	C
ART-07	Tibor jars (Japan)	Various	Private collections, Japan	Secondary market	B
ART-08	Tagál cannon-foundry	pre-1571	DESTROYED	Morga + Rizal/San Agustín	—
ART-09	Baybayin inscriptions	pre-contact	Handful survive	Archaeological	A (for surviving)
ART-10	Doctrina Christiana	1593	Library of Congress	Bibliographic	A