William Patterson Alexander | |
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| Born | July 25, 1805 |
| Died | August 13, 1884 (aged 79) |
| Occupation | Missionary |
| Spouse | Mary Ann McKinney |
| Children | William DeWitt Alexander Samuel Thomas Alexander Emily Whitney Alexander James McKinney Alexander + 5 others |
William Patterson Alexander (July 25, 1805 – August 13, 1884) was an American missionary to the Kingdom of Hawaii. His family continued to influence the history of Hawaii.