Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Virginia 2 | David Holmes | Democratic-Republican | 1797 | Re-elected | David Holmes (DR) Alexander Sinclair (F) |
| Virginia 4 | Abram Trigg | Democratic-Republican | 1797 | Re-elected | Abram Trigg (DR) |
| Virginia 5 | John J. Trigg | Democratic-Republican | 1797 | Re-elected | John J. Trigg (DR) |
| Virginia 6 | Matthew Clay | Democratic-Republican | 1797 | Re-elected | Matthew Clay (DR) |
| Virginia 7 | John Randolph | Democratic-Republican | 1799 | Re-elected | John Randolph (DR) |
| Virginia 8 | Samuel Goode | Federalist | 1799 | Democratic-Republican gain | Thomas Claiborne (DR) |
| Virginia 9 | Joseph Eggleston | Democratic-Republican | 1798 (special) | Democratic-Republican hold | William B. Giles (DR) |
| Virginia 10 | Edwin Gray | Democratic-Republican | 1799 | Re-elected | Edwin Gray (DR) Nicholas Faulcon (DR) |
| Virginia 12 | Thomas Evans | Federalist | 1797 | Retired Federalist hold | John Stratton (F) John Page (DR) |
| Virginia 13 | Littleton Waller Tazewell | Democratic-Republican | 1800 (special) | Retired Democratic-Republican hold | John Clopton (DR) Samuel Tyler (DR) |
| Virginia 14 | Samuel J. Cabell | Democratic-Republican | 1795 | Re-elected | Samuel J. Cabell (DR) |
| Virginia 15 | John Dawson | Democratic-Republican | 1797 | Re-elected | John Dawson (DR) |
| Virginia 18 | John Nicholas | Democratic-Republican | 1793 | Retired Democratic-Republican hold | Philip R. Thompson (DR) John Blackwell (F) |
Question:
When was the incumbent first elected in the district where the result was a democratic-republican gain? 
Answer:
1799.0