Question: Who first built the fortress town included in William Bennet's survey of Roman roads?
Context: Margary numbers constitute the numbering scheme developed by the historian Ivan Margary to catalogue known and suspected Roman roads in Britain in his 1955 work "The Roman Roads of Britain".  They remain the standard means used by archaeologists and historians to identify individual Roman roads within Britain.  It is not known how the Romans identified the roads they built within Britain, and well-known names such as Watling Street and the Fosse Way largely date from the Anglo-Saxon period, are sometimes ambiguous or duplicated, and cover only a small proportion of the known network. The Bishop Bennet Way is a route for horse riding in south west Cheshire, England, which can also be used by walkers and cyclists.  It is named after William Bennet (1745–1820), Bishop of Cork and Ross (1790–1794) and subsequently Bishop of Cloyne (1794–1820), who carried out detailed surveys of Roman roads including those between Deva (Chester) and Mediolanum (Whitchurch). Roman roads in Britain are long roads, mainly designed for military use, created by the Roman Army during the nearly four centuries (43 – 410 AD) that Britain was a province of the Roman Empire.  It is estimated that the Romans constructed and maintained about 2000 mi of paved trunk roads (i.e. surfaced roads running between two towns or cities) throughout the province, although most of the known network was complete by AD 180.  The primary function of the network was to allow rapid movement of troops and military supplies, but it also provided vital infrastructure for commerce, trade and the transportation of goods. The Siege of Porto Ferrajo was a French attempt to force the surrender of the Tuscan fortress town of Porto Ferrajo (now Portoferraio) on the island of Elba following the French occupation of mainland Tuscany in 1801 during the French Revolutionary Wars.  The Tuscan garrison was heavily outnumbered, but received significant support from British Royal Navy forces who controlled the Mediterranean Sea and ensured that supplies reached the garrison and that French supply convoys were intercepted.  The French began the siege with 1,500 men in May 1801, later reinforced to more than 5,000, but could not make an impression on the fortress's defences, instead seeking to starve the defenders into submission with the support of a squadron of French Navy frigates operating off the coast. Ivan Donald Margary (1896–1976) was a historian who, during his lifetime, was the leading authority on Roman roads in Great Britain.  He wrote numerous works on Roman roads of which his most influential and complete was "Roman Roads In Britain". Solimana was a minor West African state of the nineteenth century with a capital at the fortress town of Falaba.  Situated on rich slave-trading routes in what is now Sierra Leone, Solimana was visited in 1822 by Alexander Gordon Laing and in 1869 by William Winwood Reade, making it nominally British. The Siege of Kehl (14–28 October 1733) was one of the opening moves of the French Rhineland campaign in the War of the Polish Succession, at the fortress town of Kehl in the upper Rhine River valley.  A large French army under the command of the Duke of Berwick besieged and captured the fortress, which was lightly garrisoned and in poor condition. Roman roads (Latin: "viae"; singular: "via" meaning way) were physical infrastructure vital to the maintenance and development of the Roman state, and were built from about 300 BC through the expansion and consolidation of the Roman Republic and the Roman Empire.  They provided efficient means for the overland movement of armies, officials, and civilians, and the inland carriage of official communications and trade goods.  Roman roads were of several kinds, ranging from small local roads to broad, long-distance highways built to connect cities, major towns and military bases.  These major roads were often stone-paved and metaled, cambered for drainage, and were flanked by footpaths, bridleways and drainage ditches.  They were laid along accurately surveyed courses, and some were cut through hills, or conducted over rivers and ravines on bridgework.  Sections could be supported over marshy ground on rafted or piled foundations. Nicolas Bergier (] ), Avocat au Siège Présidial de Rheims, lived in 17th-century Rheims and became interested in Roman roads there.  Mentioning by chance his interest in the funding of Roman roads to Conde du Lis, advisor to Louis XIII, he found himself suddenly commanded by the king to undertake a study of all Roman roads.  Five years later he published his "Histoire des Grands Chemins de l'Empire Romain", a two-volume work of over 1000 pages.  There were many subsequent editions.  This first scholarly study of Roman roads included engravings of the Tabula Peutingeriana.  Edward Gibbon consulted Bergier's work while researching his "Decline and Fall of the Roman Empire". Deva Victrix, or simply Deva, was a legionary fortress and town in the Roman province of Britannia on the site of the modern city of Chester.  The fortress was built by the Legio II "Adiutrix" in the AD 70s as the Roman army advanced north against the Brigantes, and rebuilt completely over the next few decades by the Legio XX "Valeria Victrix".  In the early 3rd century the fortress was again rebuilt.  The legion probably remained at the fortress until the late 4th or early 5th century, upon which it fell into disuse.
Answer: the Legio II "Adiutrix"