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The columns of San Marco and San Tòdaro, or columns of Piazza San Marco, in Venice, are two tall carriages in marble and granite, placed at the entrance to the St Mark's area towards the pier and the San Marco basin. They are surmounted by the statues of the patron saints of the city: Mark the Evangelist in the traditional form of a lion and San Tòdaro (Venetian name of the Byzantine Theodore of Amasea), while on the bases they have high reliefs depicting the trades that were carried out in the square.
The two columns, together with the docks of Palazzo Ducale and the 
		Marciana Library, constitute the monumental access to the square for 
		those coming from the sea.
According to tradition, the columns 
		were erected by Nicolò Barattiero under the Doge of Sebastiano Ziani 
		(1172-1178), when the square was enlarged and monumentalised. The 
		enormous columns, transported from the East as spoils of war, were 
		originally to be three, but the third carriage was lost together with 
		the ship that carried it during the landing. The shipwrecked column had 
		to sink deeply into the mud of the seabed, so much so that "looking for 
		it twenty years after the sinking by a specially appointed master, by 
		feeling the bottom with a long pole, it could not be found in any way".
		
However, more recent interpretations date the erection of the 
		columns to the second half of the 13th century. The marbles of the two 
		columns (Egyptian red marble for the column of S.Todaro and Troadense 
		marble for the column of S.Marco) were widely used for the erection of 
		columns in late antiquity, a fact which makes their origin from 
		Constantinople almost certain . Therefore it is extremely probable that 
		the arrival of the columns in Venice, as for most of the Byzantine 
		remains present in the lagoon, can be traced back to the period of the 
		Latin Empire of Constantinople, between 1204 and 1261.
The bases 
		are made of Istrian stone, a material that began to be used in Venetian 
		construction starting from the last quarter of the 13th century, after 
		the closure of the Greek marble markets following the reconquest of 
		Constantinople by the Byzantines. In the bases there are high reliefs 
		depicting trades, evidence of the period prior to the monumentalization 
		of Piazza San Marco in the 16th century: before the 16th century, the 
		square was the site of intense economic activity. The reliefs were made 
		in a "realistic" style, which arrived in Venice in the second quarter of 
		the thirteenth century and of which various works can be observed in the 
		decorations of the Basilica: among these in particular the reliefs of 
		the bases are indebted to the representations of the crafts of the arch 
		greater, even if their lower quality suggests that they are not the work 
		of the same master.
Even the style of the capitals of the columns 
		seems to confirm the dating of the erection of the columns to the 13th 
		century. They are made of Veronese stone with pink streaks and are in 
		the Venetian-Byzantine style, as confirmed by their resemblance to 
		Ruskin's second and third styles. The capitals of the columns are also 
		very similar to the decorations of the tomb of Denaro Odifredi in 
		Bologna, built around 1265 by Venetian workers.
The column that 
		stands on the side of Palazzo Ducale holds the winged lion, symbol of 
		San Marco, patron saint and symbol of the city and the Venetian state 
		since 862. It is a very ancient Greek or Syrian bronze sculpture, 
		probably originally a chimera, to which wings were later added. On the 
		side of the Library is, however, that of San Teodoro, Byzantine saint 
		and warrior, first protector of the city, depicted in marble in the act 
		of slaying a dragon. The bust comes from a classical statue of a Roman 
		emperor, while the head, the halo, the arms and the legs resting on the 
		slain dragon are from the Middle Ages. The sculpture is a copy of the 
		original exhibited at the entrance to Palazzo Ducale. According to a 
		legend reported by Sansovino in the 16th century, the lion of S. Marco 
		looks east to symbolize the role of Venice as protector of Christianity 
		in the East, while the statue of S. Teodoro facing west would symbolize 
		the defensive attitude of the Serenissima towards the Land. This 
		explanation of the different orientation of the two statues is evidently 
		prior to the 16th century (at the time the Serenissima had already 
		established the Dominion in the Mainland) and therefore would date back 
		to the era prior to the 14th century, probably to the period prior to 
		the fall of Acre in 1291 .
Under the columns, in the Middle Ages 
		and the Renaissance, wooden shops were placed, however already from the 
		mid-eighteenth century the space between the two stelae was destined for 
		the place of capital executions, so much so that the superstitious use 
		still persists among the local population not to cross the clearing 
		between the columns. A Venetian way of saying also derives from this 
		use: "Te fasso veder mi, che ora che xe" (I'll show you what time it 
		is), derived from the fact that those sentenced to death, with their 
		backs to the basin of San Marco last thing they saw was the clock tower. 
		The space between the two columns was also the only "free zone", in 
		which it was legal to gamble, a privilege granted to Nicolò Barattiero 
		(or Barattieri), or the one who managed to find a way to erect the heavy 
		structures left stretched out on the ground for a long time: through the 
		use of large ropes that were fixed to the end of a column and then wet, 
		which, as they dried, exerted such a traction as to allow them to be 
		raised a few centimeters and to insert wooden wedges underneath, the 
		builder from Bergamo, who had already distinguished himself in the 
		construction of the belfry of the bell tower of San Marco, thus 
		accomplished the task of lifting the heavy columns without damaging 
		them. As a reward, he was granted the exclusive right to gamble at the 
		foot of the two columns, which allowed him to become quite rich.