Tychicus, from the Greek Tychikos, meaning chance or fortuitous, was a close friend and assistant to the apostle Paul. Tychicus was with Paul during his journey from Macedonia to Jerusalem, and later helped Paul when the apostle was imprisoned in Rome, before Paul sent him to Ephesus. Often unknown or overlooked by students of Bible History, Tychicus was certainly highly regarded by Paul, who referred to him as a "beloved brother and faithful minister in the Lord" (Ephesians 6:21 RSV).
Although not a great amount is recorded about him personally, Tychicus is mentioned in Acts, and four of Paul's Epistles:
"After the uproar ceased, Paul sent for the disciples and having exhorted them took leave of them and departed for Macedonia. When he had gone through these parts and had given them much encouragement, he came to Greece. There he spent three months, and when a plot was made against him by the Jews as he was about to set sail for Syria, he determined to return through Macedonia. Sopater of Beroea, the son of Pyrrhus, accompanied him; and of the Thessalonians, Aristarchus and Secundus; and Gaius of Derbe, and Timothy; and the Asians, Tychicus and Trophimus" (Acts 20:1-4 RSV)
"Pray at all times in the Spirit, with all prayer and supplication. To that end keep alert with all perseverance, making supplication for all the saints [see What Is A Saint?], and also for me, that utterance may be given me in opening my mouth boldly to proclaim the mystery of the gospel, for which I am an ambassador in chains; that I may declare it boldly, as I ought to speak. Now that you also may know how I am and what I am doing, Tychicus the beloved brother and faithful minister in the Lord will tell you everything." (Ephesians 6:18-21 RSV)
"Continue steadfastly in prayer, being watchful in it with thanksgiving; and pray for us also, that God may open to us a door for the word, to declare the mystery of Christ, on account of which I am in prison [see Prisoners Of Righteousness], that I may make it clear, as I ought to speak. Conduct yourselves wisely toward outsiders, making the most of the time. Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer every one. Tychicus will tell you all about my affairs; he is a beloved brother and faithful minister and fellow servant in the Lord." (Colossians 4:2-7 RSV)
"Do your best to come to me soon. For Demas, in love with this present world, has deserted me and gone to Thessalonica; Crescens has gone to Galatia, Titus to Dalmatia. Luke alone is with me. Get Mark and bring him with you; for he is very useful in serving me. Tychicus I have sent to Ephesus" (2 Timothy 4:9-12 RSV)
Fact Finder: Paul's 3 missionary journeys were a very important part of Bible History (see also Bible Places). The account of the 3 missionary journeys, and his later being taken to Rome as a prisoner (and his famous shipwreck along the way) are highly recommended reading.
Paul's First Missionary Journey: Acts 13:1 to 15:35
Paul's Second Missionary Journey: Acts 15:36 to 18:22
Paul's Third Missionary Journey: Acts 18:23 to 21:17
Paul's Journey To Rome: Acts chapters 27 and 28