Near the northernmost part of the Theodosian Wall there is a complex that seems to be from the 19th century with the tomb of at least one "saint" (and companions nearby). I show some pictures taken there, and the notice that explains who he was. I cannot translate this text, sorry.
Istanbul Ebu Seybe el-Hudri tomb december 2015 5155.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5162.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5160.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5158.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5159.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5156.jpg
Istanbul Ebu Seybe el-Hudri tomb december 2015 5157.jpg