Laietanian amphora production in the Baix Llobregat

Baix Llobregat, the comarca extending along the lower course of the flumen Rubricatum south and west of the colonial city of Barcino (modern Barcelona), constitutes one of the most significant amphora production zones of the ager Laietanus documented in the Piridi epigraphic database. With 524 unique objects recovered at 35 findspots distributed across 9 municipalities, the corpus reflects an intensive productive landscape whose organisation and epigraphic character are clearly defined by the evidence. The area's rise as a centre of Laietanian wine production and export is intimately connected to the founding of the colony of Barcino between 15 and 13 BC, an event that provided the commercial infrastructure — including the Via Augusta and its river crossing at the Pont del Diable, built around 10 BC to mark the navigable limit of the flumen Rubricatum — that made large-scale amphora production and maritime export viable.

The epigraphic record is defined by two inscription classes that together document the full productive cycle. Sigilla — stamped or moulded production marks — are attested on all 524 objects, establishing the corpus as overwhelmingly productive in character; the universal presence of a stamp mark confirms that systematic marking was a fundamental practice at these workshops. Tituli Ante Cocturam — marks applied to the clay before firing — appear on 182 objects, confirming that workshop identification extended to the production stage itself, before the vessel was completed. The coexistence of these two inscription classes on a substantial portion of the corpus reflects organised, multi-stage workshop administration consistent with industrial-scale figlinae.

All 524 objects belong to Laietanian wine amphora typologies. Dressel 3 Laietana is the dominant form with 342 objects, followed by Pascual 1 Laietania (164 objects) and Dressel 2 Laietana (44 objects). The hierarchy between these three forms is meaningful: Dressel 3 Laietana and Pascual 1 Laietania are the principal vehicles of export from this study area, while Dressel 2 Laietana, though present, does not reach comparable volumes — a pattern that may reflect the competitive pressure of production zones further north, where the Maresme coast and the Vallès Oriental (vinum Lauronense) concentrated Dressel 2 output with greater commercial reach. The Dressel 3 Laietana record carries two distinctive epigraphic features specific to the Baix Llobregat: stamp dies circulated across several kilns, so that a single sigillum type may appear at multiple production sites; and it is particularly common to find two associated stamps on the pivot (puntal) of the amphora, with complex combinations of cognomina that point to a shared or collaborative marking system among affiliated workshops.

Two actors are documented in the comarca through stamped inscriptions on amphorae. Caius Trocina Synecdemus, C(aii) l(ibertus) is by far the most extensively attested, documented on 38 Dressel 3 Laietana amphorae through sigilla dated to approximately the turn of the era to 30 AD — the period during which he was active as a slave in the Laietanian workshops. After his manumission he took the full name Caius Trocina Synecdemus, C(aii) l(ibertus), adopting the nomen of his patron from the gens Trocina of Barcino. He lived a long life: a funerary inscription found at the Castell de Castelldefels — within the comarca itself — records his later civic distinction as a Sevir Augustalis, the prestigious college responsible for the imperial cult in Roman colonies, an honour reserved for wealthy freedmen. The inscription was dedicated by his wife, Valeria Haline, who described him as an excellent husband. His trajectory — from enslaved person active in the amphora workshops of the Llobregat valley to Sevir Augustalis of Barcino — is one of the most fully recoverable individual biographies in the Laietanian epigraphic record. A second actor, Min(icius) Cel(---), is attested on a single Dressel 3 Laietana amphora through a sigillum, dated fin. s. I a. Chr. – p. sec. Tiberius, placing him at an earlier phase of the comarca's productive history.

The geographic distribution of the 524 objects articulates the productive landscape of the lower Llobregat valley with considerable clarity. On the right bank, Sant Vicenç dels Horts accounts for 233 objects across 12 sites — the two dominant loci, Antic Mercat (115 objects) and carrer Francesc Moragas 17–19 (93 objects), almost certainly correspond to major kiln complexes — while Sant Boi de Llobregat contributes 95 objects from nine sites, with the Termes Romanes (41) and Plaça Constitució (30) as its principal recovery points. On the left bank, further upstream, El Papiol (Can Tintorer, 108 objects) and Castellbisbal (Can Pedrerol, 71 objects) each present the concentrated, single-site pattern characteristic of a discrete figlina. Together, these four municipalities account for 507 of the 524 objects, tracing an almost continuous productive corridor along both banks of the navigable flumen Rubricatum as far as the Pont del Diable. At Viladecans, the Ancoratge de Les Sorres (7 objects) — an anchorage site on the Llobregat delta — provides direct evidence of maritime loading and the coastal transfer of Laietanian amphorae, connecting the river transport corridor to the broader Mediterranean distribution network. The remaining municipalities along the valley (Rubí, Sant Joan Despí, Cornellà de Llobregat, Gavà) contribute marginal finds that complete the picture of a productive landscape organised around the complementary axes of river navigation and Mediterranean maritime trade.