The firstinhabitantsof the cityofVenicecan not beconsideredfugitivesas theirancestors, butthey hadalreadydevelopedvariousactivitieson the sea.Many ofthemwere still livingin thefishingandsalt trading, otherswerecalafatariandcarpenters, but themostwealthyalreadypushedtheirtradeoutsidethelagoon.
Islands in the lagoonnearMalamocco,thetransferof theducalseathad toinvolvean intensificationof settlements.In775-776therewascreatedthebishopricof Olivolo.During the reignofAngeloParticipazio(809-827)theducalseatwasthenmovedfromMalamoccothebestdefense"Rivoalto"(present-Rialto).They werebuilt themonasteryofSanZaccaria, afirstducal palaceandthe firstbasilicaofSanMarco.
In 828theVenetiansmovedthebodyof St Markinthe chapelof theDucal Palace,alreadyrisento the Rialto.According tolegend,two merchants,TribuneandRustico, a captaininAlexandriawhentheCaliphwaslootingtheChristian churchwhere he hadkeptthebodyofSt.Mark(who was martyredin68).Fearingthatthe sacredbodywasdesecrated, thetworobbed fromthemerchants,carrying iton theirshipinawoodenboxcoveredwithquarter-pig.TheVenetiansthengave himhonorableburialin thebasilicaofSanMarcoandthe firstelected himtheir patron.Thiseventincreasedtheprestigeof Venice,notonlyas aducal capital, butas areligioussiteandlaterinvolvedthetransferof the patriarchal see.
897DogePietrotribuneerectedadefense(civitatismurus)betweenOlivoloandRialto.Thebuilding materials forthesebuildings,according to the customof the time,weretakenfromthe ruinsofthe ancientRoman citiesclosertothe coast, particularlyfromAltino.