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Among canon of classical orders of classical architecture, the Tuscan order's place is due to the influence of the Italian Sebastiano Serlio, who meticulously described the five orders including a "Tuscan order", "the solidest and least ornate", in his fourth boo of Regole generalii di Architettura... sopra le cinque maniere degli edifici... (1537). Though Fra Giocondohad attempted a first illustration of a Tuscan capital in his printed edition of Vitruvius (1511), he showed the capital with an egg and dart enrichment that belonged to the Ionic order. The "most rustic" Tuscan order of Serlio was later carefully delineated by Andrea Palladio. From the perspective of these writers, the Tuscan order was an older primitive Italic architectural form, predating the Greek Doric and Ionic, associated by Serlio with the practice of rustication and the architectural practice of Tuscany, Giorgio Vasari made a valid argument for this claim by reference to il Cronaca's graduated rustication on the facade of Palazzo Strozzi,
Florence, like all architectural theory of the Renaissance, precedents for a Tuscan order were sought for in Vitruvius, who does not include it among the three canonic orders, but peripherally, in his discussion of the Etruscan temple (book iv, 7.2-3). Later Roman practice ignored the Tuscan order, and so did Leon Battista Alberti in De re aedificatoria (shortly before 1452).
Following Serlio's interpretation of Vitruvius (who gives no indication of the column's capital), in the Tuscan order the column had a simpler base — circular rather than squared as in the other orders, where Vitruvius was being followed — and with a simple torus and collar, and the column was un-fluted, while both capital and entablature were without adornments. the modular proportion of the column was 1:7 in Vitruvius, and in Palladio's illustration for Daniele Barbaro's commentary on Vitruvius), in Vignola's Cinque ordini d'architettura (1562), and in Palladio's Quattro libri (1570). Serlio alone gives a stockier proportion of 1:6. A plain astragal or taenia ringed the column beneath its plain cap.Palladio agreed in essence with Serlio:"The Tuscan, being rough, is rarely used above ground except in one-story buildings like villa barns or in huge structures like Amphitheatres and the like which, having many orders, can take this one in place of the Doric under the Ionic. but unlike the others could find Roman precedents, of which he named the arena of Verona and the Pula Arena, both of which, James Ackerman points out are arcuated buildings that did not present columns and entablatures.
A striking feature is his rusticated frieze resting upon a perfectly plain entablature. In its simplicity, The Tuscan order is seen as similar to the Doric order, and yet in its overall proportions and inter-columniation, it follows the ratios of the Ionic order.
This strong order was considered most appropriate in military architecture and in docks and warehouses when they were dignified by architectural treatment. Serlio found it "suitable to fortified places, such as city gates, fortresses, castles, treasuries, or where artillery and ammunition are kept, prisons, seaports and other similar structures used in war. Because the Tuscan mode is easily worked up by a carpenter with a few planing tools, it became part of the vernacular Georgian style that has lingered in places like New England and Ohio deep into the 19th century. In gardening, "carpenter's Doric" which is Tuscan, provides simple elegance to gate posts and fences in many traditional garden contexts.