St Timothy is most famous as the recipient of two of the letters of St Paul. He accompanied St Paul on several of his journeys, and was consecrated as bishop of Ephesus by him in 65 AD. He was martyred in the year 80 AD when he tried to stop a pagan procession through the streets.
Pope Benedict XVI gave a General Audience on him (and St Titus) back in 2006 which is well worth reading:
Dear Brothers and Sisters,
Having spoken at length on the great Apostle Paul, today let us look at his two closest collaborators: Timothy and Titus. Three Letters traditionally attributed to Paul are addressed to them, two to Timothy and one to Titus.
Timothy is a Greek name which means "one who honours God". Whereas Luke mentions him six times in the Acts, Paul in his Letters refers to him at least 17 times (and his name occurs once in the Letter to the Hebrews).
One may deduce from this that Paul held him in high esteem, even if Luke did not consider it worth telling us all about him.
Indeed, the Apostle entrusted Timothy with important missions and saw him almost as an alter ego, as is evident from his great praise of him in his Letter to the Philippians. "I have no one like him (isópsychon) who will be genuinely anxious for your welfare" (2:20).
Timothy was born at Lystra (about 200 kilometres northwest of Tarsus) of a Jewish mother and a Gentile father (cf. Acts 16:1).
The fact that his mother had contracted a mixed-marriage and did not have her son circumcised suggests that Timothy grew up in a family that was not strictly observant, although it was said that he was acquainted with the Scriptures from childhood (cf. II Tm 3:15). The name of his mother, Eunice, has been handed down to us, as well as that of his grandmother, Lois (cf. II Tm 1:5).
Chosen for his good reputation
When Paul was passing through Lystra at the beginning of his second missionary journey, he chose Timothy to be his companion because "he was well spoken of by the brethren at Lystra and Iconium" (Acts 16:2), but he had him circumcised "because of the Jews that were in those places" (Acts 16:3).
Together with Paul and Silas, Timothy crossed Asia Minor as far as Troy, from where he entered Macedonia. We are informed further that at Philippi, where Paul and Silas were falsely accused of disturbing public order and thrown into prison for having exposed the exploitation of a young girl who was a soothsayer by several unscrupulous individuals (cf. Acts 16:16-40), Timothy was spared.
When Paul was then obliged to proceed to Athens, Timothy joined him in that city and from it was sent out to the young Church of Thessalonica to obtain news about her and to strengthen her in the faith (cf. I Thes 3:1-2). He then met up with the Apostle in Corinth, bringing him good news about the Thessalonians and working with him to evangelize that city (cf. II Cor 1:19).
We find Timothy at Ephesus during Paul's third missionary journey. It was probably from there that the Apostle wrote to Philemon and to the Philippians; he sent both Letters jointly with Timothy (cf. Phlm 1; Phil 1:1).
From Ephesus, Paul sent Timothy to Macedonia, together with a certain Erastus (cf. Acts 19:22), and then also to Corinth with the mission of taking a letter to the Corinthians, in which he recommended that they welcome him warmly (cf. I Cor 4:17; 16:10-11).
We encounter him again as the joint sender of the Second Letter to the Corinthians, and when Paul wrote the Letter to the Romans from Corinth he added Timothy's greetings as well as the greetings of the others (cf. Rom 16:21).
From Corinth, the disciple left for Troy on the Asian coast of the Aegean See and there awaited the Apostle who was bound for Jerusalem at the end of his third missionary journey (cf. Acts 20:4).
From that moment in Timothy's biography, the ancient sources mention nothing further to us, except for a reference in the Letter to the Hebrews which says: "You should understand that our brother Timothy has been released, with whom I shall see you if he comes soon" (13:23).
To conclude, we can say that the figure of Timothy stands out as a very important pastor. According to the later Storia Ecclesiastica by Eusebius, Timothy was the first Bishop of Ephesus (cf. 3, 4). Some of his relics, brought from Constantinople, were found in Italy in 1239 in the Cathedral of Termoli in the Molise.