The poem "The Doer of Good" by Oscar Wilde appears to take place in the Holy Lands during the time of Christ.
The two allusions of the two men in the story refer to a leper and a blind man, both of whom Christ healed in the New Testament accounts in the Bible.
The sense of the central figure of the story being Christ is supported by Wilde's allusions to the two miracles mentioned above, as well as his use of the capitalized pronouns "He" and "His," as is done in the New Testament referring to Christ, and throughout the Bible when referring to God.
The theme of the story (that human nature is hard to change, even in the face of life-altering circumstances) can be applied to any time period and any situation, as it refers to the human condition. However, the structure Wilde uses to present the theme using [well-known] allusions, and his use of Biblical "voice" in the narrative provide (at least figuratively) a setting of the Holy Lands where Christ and His disciples lived and worked.