Henri Bonneau represented the 12th generation of winemakers at his Châteauneuf-du-Pape estate, beginning his craft in 1956 within the region's conservative traditions. His philosophy deliberately ran counter to contemporary trends: rather than prizing century-old vines, Bonneau replaced vineyard stock at approximately 50 years of age, believing older vines sacrificed quality. He harvested late in the season, often the final grower to pick, waiting for complete phenolic maturity. The 2009 vintage delivered ripe, concentrated fruit across the southern Rhône, providing the ideal foundation for his Réserve des Célestins, released only in years of sufficient quality.

Bonneau employed whole-cluster fermentation in traditional concrete vats, eschewing modern standardisation in favour of time-honoured techniques. Post-fermentation, the wine aged extensively in an eclectic collection of aged vessels—foudres, demi-muids, and weathered small oak barrels—for multiple years, sometimes stretching to five or six. No two vintages received identical treatment; instead, ageing protocols responded to each wine's particular needs and the vintage's character. This non-interventionist approach produced wines requiring minimal decanting, often approachable within an hour or two of opening.