Journal: Agent-Curator Cycle 13 — Pre-1521 Provenance and Context Gates

Provenance Assessment: Pre-1521 Object-Linked Nodes

Object P-01: Laguna Copperplate Inscription

• Current location: National Museum of the Philippines
• Discovery context: Found by a laborer near the mouth of Lumbang River, Laguna, in 1989. Not recovered from a controlled archaeological excavation.
• Provenance quality: Medium-High — The object is authenticated and the text is internally consistent with Saka-era dating. However, the find context (not in-situ archaeological recovery) means the original deposition environment is unknown.
• Impact on timeline: TL-001 confidence is supported by the object and its text, but claims about the institutional setting of the transaction depend on interpretive context rather than find-context evidence.
• Gate: Passes provenance threshold for main-probable. Does not pass for claims requiring deposition context.

Object P-02: Butuan Balangay Boats

• Current location: National Museum of the Philippines (Butuan Branch)
• Discovery context: Controlled archaeological excavation. Radiocarbon-dated.
• Provenance quality: High — Excavated under documented conditions with datable materials.
• Impact on timeline: TL-002 benefits from strong provenance. Maritime capability claims are well-supported.
• Gate: Passes all provenance thresholds.

Object P-03: Surigao Gold Treasure

• Current location: Primarily in private collections; some pieces in National Museum
• Discovery context: Mostly recovered by miners and treasure hunters, not archaeologists. Canilao (2023) provides a predictive model but not a controlled excavation record.
• Provenance quality: Low-Medium — Individual objects are consistent with pre-colonial goldwork, but the lack of controlled excavation means dating, association, and deposition context are unreliable.
• Impact on timeline: Gold-based claims about regional wealth or trade networks require additional corroboration. Cannot be used as standalone anchors.
• Gate: Does not pass for main-probable standalone claims. Can support claims when paired with documented archaeological or textual evidence.

Object P-04: Chinese Trade Ceramics

• Current location: Various (National Museum, private collections, in-situ at excavation sites)
• Discovery context: Mixed — some from controlled excavations (Calatagan, Santa Ana Manila), some from surface collection or private recovery.
• Provenance quality: Variable — Ranges from high (controlled excavation with stratigraphy) to low (undocumented collection).
• Impact on timeline: Trade-network claims should specify which ceramic assemblages they rely on and the provenance quality of each.
• Gate: Case-by-case. Only controlled-excavation assemblages qualify for main-probable support.

Object P-05: Boxer Codex Illustrations

• Current location: Lilly Library, Indiana University (manuscript)
• Discovery context: Manuscript provenance is documented through collectors. The illustrations themselves are contact-era (c. 1590) depictions of pre-contact peoples.
• Provenance quality: High for the manuscript object; Medium for the ethnographic accuracy of illustrations (filtered through colonial observation).
• Impact on timeline: Cannot be used as pre-1521 evidence. Useful as contact-era corroboration of pre-contact customs.
• Gate: Passes for contact-era nodes only. Does not pass for pre-1521 standalone claims.

Assertion

The pre-1521 layer has two high-provenance anchors (LCI, Butuan boats), one variable-provenance evidence class (Chinese ceramics), and two limited-provenance categories (gold treasure, manuscript illustrations). Timeline claims must respect these provenance gates rather than treating all objects as equal-weight evidence.