Perhaps identical with Sinadin Kalojan? Died with all probability before 1290. His sons were at that time infants. He died as monk Ioakeim on 6 February (Ὡσαύτως ποιήσετε μνημόσυνα καθ’ ἑκάστην τοῦ χρόνου περίοδον τὴν ἕκτην τοῦ φευρουαρίου μηνὸς καὶ ὑπὲρ τοῦ μακαρίου κτήτορος ὑμῶν τοῦ μεγάλου στρατοπεδάρχου Ἀγγέλου Δούκα τοῦ Συναδηνοῦ κυροῦ Ἰωάννου, τοῦ διὰ τοῦ θείου καὶ ἀγγελικοῦ σχήματος μετονομασθέντος Ἰωακεὶμ μοναχοῦ). He was a κῦρ. He was toparch of Polog before 1275/1276 (ὁ δέ γε πατὴρ τοῦ πρὸς ἑσπέραν κατὰ τὴν Δαλματίαν λεγομένου Πολόγου τοπάρχης ἦν) and Megas stratopedarches from 1275/1276 to 1283/1284. He married his wife Theodora Komnene Palaiologina approximately in 1280 or 1281. He was the father of Ioannes Komnenos Dukas Palaiologos Synadenos, Theodoros Dukas Palaiologos Komnenos Synadenos, Euphrosyne Komnene Dukaina Palaiologina and a daugher not known by name, who was a candidate bride for the Bulgarian King Teodor Svetoslav Terter. He defected to Michael VIII Palaiologos probably after the battle at Pelagonia in 1259. The Byzantine emperor rewarded him with the title of megas stratopedarches. In 1275/1276 he fought together with Michael Kaballarios against the army of Ioannes Dukas, the ruler of Thessaly. He was defeated and captured at Pharsalos. He was one of the generals, who beat the army of Charles I of Anjou at Berat in April 1281. He joined an unsuccessful naval expedition to Thessaly in 1283/1284. He is honoured as a ktetor of the convent of the Holy Mother of God Bebaia Elpis in Constantinople according to the Typikon of his wife Theodora for the convent of the Holy Mother of God Bebaia Elpis in Constantinople. He possessed a small private library with several manuscripts.