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leave his abode on tjoannitza phocis for the neighbourhood of patras where he spent ten years，only returng ho after syon&r;s death（｜－927）diehl，choses et ns de byzance 3 f，therefore puts the bulgarian vasion of northern greece 917but this is ipossible as syon fought at achelo augt 917 and at catasyrtae at the end of 917 or begng of 918this has been noted by runcian，roan lecapen 84 and bulgarian epire 159，but he is wrong sugstg 916 as the datehe rightly rearks，however，that the phrase&l;ten years&r;should not be taken too literally，and 1 would sugst that a round figure of this kd stands for a shorter，rather than a lonr，period than the specified tenas diehl has already ephasized，syon&r;s strong drive to northern greece was undoubtedly the result of the victory at acheloeverythg therefore pots to 918 as the date for the greek capaignthere sees to be no rean for puttg it the period after the aession of roan lecapen as zlatarski does，givg the date as 920（istorija 1，2，pp405 ff；cfutafciev，istorija1，232）。

[150]cfvgrul，eo 36（1937）52 ff，and fdolr，bz 37（1937），532

[151]for the year 920（not 919）cfvgrul，&l;notes de chronologie byzante&r;，eo 35（1936），333 ffroan appeared at the uncil of union of july 920 as basileopator，which dicates（as grud notes）that his ronation as eperor did not take place 919，and al that he had not yet been given the title of caesar

[152]on the chronology cfdolr，reg604，where it is rightly ephasized that it is not possible to defe the date ore c