Name customarily given to set of 6 str. qts. by Mozart (No.14 in G, K387 (1782), No.15 in D minor, K421 (1783), No.16 in E♭, K428 (1783), No.17 in B♭, Hunt, K458 (1784), No.18 in A, K464 (1785), No.19 in C, Dissonanzen, K465 (1785), because he ded. them to Haydn, who played 1st vn. in perfs. at Mozart's house (Mozart played the va.).