Tzetzes wrote eight letters before his brother's death in 1138

Summary:
In (1) he asked Ioannes Koukoumas, however busy he claimed to be, to return a book he had borrowed. In (2) he wrote to Michael Bourtzes, nephew of the protovestiarites, who had accused him of responsibility for their lack of contact: but Michael had stopped near Ioannes' house and was invited in, but refused, so Ioannes denied the charge. Ioannes wanted to give him a belt, by messenger or face-to face. In (3) the retainers of Michael Taronites, protonobellisimos, congratulated Tzetzes for living near a man who was wealthy as Croesus. In fact, he got nothing from this neighbour but a sense of exclusion, despite his own healthy lifestyle and respectable background. In (4) he thanked Polyeuktos the logariastes for a mule, which, however, Ioannes had been unable to ride; he blamed fate, which jinxed him even in such details, though he was respectable both in descent and in character. In (5) he told Isaakios Komnenos to sack his secretary Lepreos, whom he damned by many negative adjectives, confirmed by many famous secretaries called up from the underworld. Nobody will blame Isaakios or Tzetzes for this essential act, even if Lepreos was a friend. In (6) he wrote for a deacon, seeking a bishopric from a senior bishop who had promised him one. In (7) he wrote to his student Andronikos Kalorabdas, who had not written to him, probably under the influence of some Homeric drug. Andronikos was advised to reprove his employer gently for any broken promises, and as well as his duties to do various exercises from his book on rhetoric. In (8) he wrote to the hegoumenos of the Pantepoptes monastery on behalf of a man earlier saved by shelter given in the monastery. But when he left, he suffered many problems, including imperial displeasure, lost all his money, and now petitioned the hegoumenos to return. 
Dates:
1135 (Guess) 
Andronikos Kalorabdas, ex-student of Tzetzes (Andronikos 117)
  • He had not written to Ioannes 459, probably under the influence of some Homeric drug; he was advised to reprove his employer gently for any broken promises and as well as his duties to do various exercises from his book on rhetoric (:) Tzetzes, Letters 16.14-17.19
Lepreos, grammatikos (Anonymus 733)
  • His employer Isaakios 105 was told by Ioannes 459 to sack him; his skills and character were utterly condemned, by Ioannes and dozens of secretaries he called up from the underworld; many precedents were quoted for the ruthless action needed (:) Tzetzes, Letters 9.1-15.13
deacon who was looking for a bishopric (Anonymus 735)
  • He reminded Anonymus 736 that he had promised to find him a see, when one became available; now that Medeia had lost her bishop, the validity of that promise would be put to the test (:) Tzetzes, Letters 15.15-16.13
bishop who promised to help a deacon find a see (Anonymus 736)
  • He was said to have promised to find Anonymus 735 a see, when one became available; now that Medeia had lost her bishop, the validity of his promise would be put to the test (:) Tzetzes, Letters 15.15-16.13
hegoumenos of the Pantepoptes monastery (Anonymus 737)
  • He had sheltered Anonymus 738 before, and saved him from a crisis; but when he left the monastery, the man suffered many problems, including imperial displeasure, and become very poor; he now received from his old guest a plea to return (:) Tzetzes, Letters 17.20-18.17
poor ex-resident seeking to return to the Pantepoptes monastery (Anonymus 738)
  • He had been saved by the shelter given by Anonymus 737 and his monastery; but when he left, he suffered many problems, including imperial displeasure, lost all his money, and now petitioned the hegoumenos to return (:) Tzetzes, Letters 17.20-18.17
Ioannes Tzetzes, man of letters (Ioannes 459)
  • He wrote to Ioannes 460, asking him, however busy he claimed to be, to return a book he had borrowed (:) Tzetzes, Letters 4.14-5.7
  • He denied reponsibility for lack of contact with Michael 277, since Michael had stopped near his house and been invited in, but had refused (friends did not need announced visits); he wanted to give Michael a belt, by messenger or face-to face (:) ζωνάριον Tzetzes, Letters 5.8-6.12
  • The retainers of Michael 278 complimented him on living close to Anonymus 732, like a rich retainer, precursor of Croesus himself; in fact, he got nothing from this but a sense of exclusion, despite his healthy lifestyle and respectable background (:) Tzetzes, Letters 6.13-8.9
  • He thanked Polyeuktos 102 for a mule, though he had not been able to ride it; he blamed fate, which treated the poor and disreputable well, while he, despite his respectable descent and character, was jinxed, even over mules (:) Tzetzes, Letters 8.10-20
  • He told Isaakios 105 to sack Anonymus 733, whom he damned by many negative adjectives, confirmed by many famous secretaries called up from the underworld; nobody will blame Isaakios or Tzetzes for this vital act, even if Lepreos was a friend (:) Tzetzes, Letters 9.1-15.13
  • His ex-student, Andronikos 117, must have taken some Homeric drug of forgetfulness, for he had not written: he should reprove his employer gently for any broken promises; as well as his duties he must do various exercises from his book on rhetoric (:) Tzetzes, Letters 16.14-17.19
Ioannes Koukoumas, who borrowed a book from Tzetzes (Ioannes 460)
  • He was asked in a letter from Ioannes 459, however busy he claimed to be, to return a book he had borrowed (:) Tzetzes, Letters 4.14-5.7
V 56: Isaakios - Ioannes Komnenos, son of Konstantinos, megas droungarios (Isaakios 105)
  • He was told by Ioannes 459 to sack Anonymus 734, who was damned by many negative adjectives, confirmed by many famous secretaries called up from the underworld; nobody would blame Isaakios or Tzetzes for this vital act, even if Lepreos was a friend (:) Tzetzes, Letters 9.1-15.13
Michael Bourtzes, nephew of the protovestiarites (Michael 277)
  • He had accused Ioannes 459 of responsibility for lack of contact between them; however he stopped near Ioannes' house and was invited in, but refused, so Ioannes denied the charge; Ioannes wanted to give him a belt, by messenger or face-to face (:) ζωνάριον Tzetzes, Letters 5.8-6.12
Michael Taronites, protonobellisimos (Michael 278)
  • His retainers congratulated Ioannes 459 for living near the very wealthy Anonymus 732; in fact, he replied, despite his healthy lifestyle and respectable background, all he got from his neighbour was a sense of exclusion (:) Tzetzes, Letters 6.13-8.9
Polyeuktos, logariastes (Polyeuktos 102)
  • He had provided Ioannes 459 with a mule, and was heartily thanked for it; however, Ioannes had been unable to ride it, blaming fate, which jinxed him even in such details, though he was respectable both in descent and in character (:) Tzetzes, Letters 8.10-20